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Why is an unknown number displayed? Why are incoming numbers not detected on my phone?

The Caller ID function, or automatic caller ID, is available from any mobile communications provider. It is thanks to this function that the number series of the calling subscriber is displayed on the screen of our phone. However, it happens that your cellular device receives calls from an unknown recipient. How to find out who called from an unknown number? This review presents all the methods for declassifying and verifying unknown recipients of various television systems.

How to find out a hidden number from different telecom operators?

Today, in addition to the Caller ID service that is valid on absolutely all mobile devices, cellular operators have the Anti-Caller ID function in their arsenal. Through this service, the subscriber can hide the number series of his mobile phone from the interlocutor. However, the anti-determiner is also not omnipotent, and if desired, the invisible addressee can always be declassified.

If you are bothered by calls from an unknown interlocutor, then you can use the “Hidden Number Identifier” mobile service, which is available in almost any television system.

But there is a “but” here. Firstly, the service may not affect subscribers of other cellular networks, and secondly, it is not free.

It must be said that different television systems have their own methods of declassifying “incognito”. However, perhaps the most reliable verification method is call detailing. This service is also not free, however, it can show 100% efficiency. Now let’s find out how the declassification of “incognito” subscribers takes place using examples from various television systems.


In Tele2, you can recognize a call from an unknown subscriber using the “Intentionally Hidden Number Identifier” service. After activating the service, the user will be able to see the number series of all telephone strangers. Next, the client decides what to do with such interlocutors; for example, he can add them to his contact list and then blacklist them.

It must be said that the function that reveals hidden numbers is not basic and requires a separate connection. Any Tele2 user on any tariff plan can activate it. However, there are some peculiarities here too:

The mobile operator guarantees the correct operation of the service only within the home region. However, practice shows that incoming calls from various areas, and from phones of other television systems, are also declassified in most cases.

If the user's account does not have the required amount to pay the subscription fee, the function is automatically suspended. As soon as the balance is replenished, the function will begin operating in standard mode.

As for connecting it, you can do this:

  • in your Personal Account by entering the “Tariffs and Options” section;
  • by sending the USSD command * 210 * 1 # ;
  • at the Tele2 office.

Immediately after turning on the service, the monthly fee (daily fee) will be debited from the account and the option will begin to work. By the way, after the subscriber resolves issues with an unknown interlocutor, the service can be disabled. All the methods described above are suitable for this. As for the system request for deactivation, it will look like this * 210 * 0 #.

The cost of connection will depend on the locality where the user lives. For example, for the Belgorod region, you will have to pay 3 rubles for connection, and residents of the capital will have to pay 5 rubles. The tariff for using the service per day will be similar, that is, 3 and 5 rubles, respectively.

More detailed information about prices for your region can be found by calling 655.


In the case of revealing an unknown number to Megafon, before activation, the user can test the identification service. The free period lasts seven days, after which a subscription fee will be charged for using the product.

Any client of a mobile operator can activate “Super Caller ID”. However, Megafon warns that the product will function correctly only within its network.

There are several ways to enable the product on your phone:

  • send the system request: * 502 # ;
  • send an empty message to 5502 ;
  • You can enable the option in your personal account, in the “Tariffs and Services” section;
  • in the Megafon office center.

It is important to understand that upon activation, the account must have the required amount to pay the subscription fee. The cost of the service is 3.50 rubles/day. If the user's account does not have enough funds to pay for the service, the declassification of unknown callers will be suspended. As soon as the mobile account is topped up, the function will start working in standard mode.

You can deactivate the option through your Personal Account, in the telesystem office, or by requesting * 502 * 4 #.

If you want to find out an incognito phone number for free, then you will have to force him to text you. The fact is that the AntiAON service does not apply to text messages, and a previously unknown interlocutor will be displayed on the screen of your device.


If you are wondering how to find out who called from a hidden number on Beeline, then here you can bring the caller to light within the framework of the “Super ON” service. Any telesystem client can activate this option on their mobile phone. After “whose unknown number” is opened, the option can be disabled.

It must be said right away that this function on Beeline cannot be called cheap. The activation of the product itself is provided free of charge, but its use is charged as follows:

  • for prepaid tariff plans – 50 rubles/day;
  • for postpaid tariff plans – 1500 rubles/month.

It is important to understand that if there is a lack of funds to pay the subscription fee, the operation of the service will be suspended.

You can activate the option in several ways:

  • send USSD command * 110 * 4161 #;
  • call 06744161;
  • enable the functionality in your personal account, in the “Tariffs and Services” section;
  • order the activation of the determinant at the Beeline office.

When the option is no longer needed, you can disable it:

Through your personal account;

  • in the office center of the mobile operator;
  • via USSD command * 110 * 4160 # ;
  • by calling 06744160.

Despite its high cost, the Beeline product has more extensive capabilities. For example, to identify hidden interlocutors, the subscriber does not need to be on the home network, since this option works correctly throughout Russia, regardless of where it is activated.

In addition, the option can recognize incoming messages in various formats: long-distance, local, international.


Now let's find out how to identify a hidden number on an MTS phone. To declassify incognito interlocutors, the television system uses the “Super Caller ID” option. Immediately after activating the product, the caller will no longer be unknown. This option works on all MTS tariff plans with the exception of the “Cool” tariff. There are generally many different restrictions on this TP due to the fact that it was developed specifically for school-age children.

It must be said that “Super Caller ID” on MTS is not a cheap pleasure. When activating the product, the client will have to fork out 2000 rubles! The price is of course wild, but don’t be alarmed, this amount is paid once. Subsequently, you will need to pay 6.50 rubles per day for the option.

Despite the high cost of the product, the mobile operator can guarantee the declassification of hidden numbers only in the local network. The option may also not function correctly on older mobile phones. The list of unsupported cellular devices can be viewed on the official MTS website.

When the service is no longer needed, it can be turned off. Deactivation is provided free of charge. However, if you reconnect, you will again have to pay 2,000 rubles for activation.

If such prices do not scare you, then below are ways to connect to MTS “Super Caller ID”. So, you can enable the function:

  • in your Personal Account or the “My MTS” application;
  • at the nearest MTS office;
  • by sending a USSD request * 111 * 007 #.

You can disable the service in your personal account or mobile application, as well as in the office center of the telesystem. For more information, please contact technical support at 0890.


If you do not want to connect computing services, but, nevertheless, you need to reveal the anonymity of the caller, then call detailing will come to the rescue. This service is provided by all mobile operators in Russia, but its cost will depend on the specific television system.

Costs and connection methods can be viewed on the official websites of operators. And also on the question of how to view a hidden number using details, you can contact the office of a particular cellular provider.

Over the past couple of years, there have often been cases where the mobile phone does not display the numbers of incoming calls. At the same time, it does not matter at all what kind of mobile operator serves you, the model and brand of the phone. The situation was noticed on Nokia, Xiaomi, HTC, Samsung, and with mobile operators MTS, Tele2, Megafon, Beeline, etc.

In the article we will tell you what to do if the incoming number is defined as “Unknown”, or the contacts previously recorded in the book are not displayed.

All incoming calls are detected as "Unknown"

Reasons for failure

This situation has already become fatal for many. People could not come up with anything, although they tried various methods, even replacing SIM cards. We will try to do without extremely radical measures. There are few reasons why problems may occur. Causes:

  • no money on the phone;
  • incorrect number display status;
  • broken parameters of the telecom operator and the device itself;
  • copying contacts from one device to another, resulting in failures;
  • selected country in the smartphone settings;
  • incorrectly saved contacts (shortening numbers (+7..);
  • duplicate numbers;
  • there is not enough space on the phone, and both clogged RAM and lack of internal memory are to blame;
  • network activation via Gevey Sim was used;
  • The phone has been updated or flashed (manual flashing).

Some operators ask you to activate the service in order to show the numbers of incoming calls. You're in luck - it's free. Unfortunately, the operator does not always notify the user about this.

What to check if incoming numbers are not detected?

This problem can be solved quite simply, you're in luck. And even if the steps below do not fix the problem, change the SIM card. Moreover, now when you replace a SIM card, your phone number is saved.

First of all, we check the following

If you have an iPhone

If you have an iPhone and you have activated the network through “Gevey Sim”, look at which country is indicated in the smartphone settings. Play around with different countries. Sometimes it helps to expose European states, Russia, China and others. Don't worry, nothing should change on your smartphone. Plus, everything can be returned.

Reset

If the device has recently been updated or reflashed, you can roll back the system or reset it to factory settings. Go to “Settings” - “General settings” - “Backup and reset” - “Reset device”.

There is another way - turn off the smartphone - simultaneously hold the “Volume up”, “Menu key” buttons (if it is not there, skip the item) and the “Power off/on” button. We advise you not to release the keys (except for the “Shutdown” button) for about 20 seconds (until Recovery appears). After the new window appears, you need to select (using the volume keys) the desired item - factory reset. We reset and delete all data. After this, reboot the device.

The point above can help with any difficulties associated with our problem.

If it says unknown number on Xiaomi

Recently, many problems have been caused with Xiaomi brand phones. This is because they have their own MIUI system. To troubleshoot, simply disable its optimization.

  1. “Settings” - “About device” - “MIUI version” (actively click on the item 10 times) - the “Developer settings are open” sign will appear on the screen.
  2. We go back, click “Advanced” - the “For Developers” menu appears.
  3. Click and turn off system update.

Also, check if you have the official version of the Xiaomi smartphone. Perhaps you bought a device with a ROM version, and not a European or Chinese one. The ROM version is a re-flashed Chinese license for a European (illegal) one. Often issued in stores as “For Europe”. In this case, only flashing will do.

Conclusion

Be sure to check the tips above if you are not seeing incoming call numbers. In most cases, the failure can be resolved very quickly and easily. If suddenly the advice does not help, up to the firmware. You will have to go to the service center and show the device. But before that, check the operation of another SIM card on this phone. If there are no problems with it, then go to the operator’s branch and change the SIM card.

", then you can activate the service as "Caller Identifier". To do this, log into the Service Guide server via a PC using your username and password. You need to select the required item and click “Connect”.

Use the “One-time Anti-AON” service if you need to block the identification of your number for one call. The Anti-Caller Identifier (Anti-Caller ID) service helps hide the identification of your mobile phone license plates when calling another person’s mobile device. To connect a one-time anti-identifier, you need to dial the required subscriber in the following format: #31#mobile number.

Send a message to number 000105501 or dial *105*501#. Don't forget to click on the "Call" button.

If you use the services of the Beeline operator, then to classify the number you can activate the AntiAON service by simply dialing the numbers 0628 on your phone. Next, follow the instructions of what the autoinformer will say.

Activate the MTS number anti-identifier by opening the “Internet Assistant”. Log in to your personal account. Then select “Service Management”, then check the box next to “Anti-AON” and click “Connect”. You can also make your MTS cell phone number unidentifiable without the Internet. From your phone, dial a set of characters and numbers *111*46# and send a call. And after a couple of seconds you should receive a message stating that the service has been successfully connected.

Also, if you want to classify your MTS number for only one call, then you need to activate the AntiAON on request service. Dial “*111*84#” from your phone. You can activate the same option by logging into your “Internet Assistant” personal account. After this, you need to dial the subscriber in the format +7(XXX)XXX-XX-XX.

Helpful advice

Study the cost of services on your tariff plan. Such information can be found on the website of the relevant operator.

Sources:

  • why can't my phone detect numbers?

Nowadays, when every cell phone has automatic identification enabled A, the only way to hide your phone is to activate the “Anti-identifier” service numbers" Let's consider how to connect this service to each of the Big Three operators.

Instructions

Invite Human and at a specific time in a specific place. State the specific purpose of your meeting. Suggest Human Have an interesting activity that you can do together. Arouse his keen interest.

If Human refuses to meet with you, politely and gently ask him to explain his refusal to you. Perhaps he misunderstood something, or maybe he has a lot of important and urgent things to do. In case of refusal, do not rush to attack Human but with indignation and reproaches. Try to calmly listen to the explanations and understand his point of view. It can be useful to put yourself in someone else's shoes Human A.

If your chosen one Human doesn’t want to meet you in any way, take it for granted and calm down. Switch to something else. Meet and chat with loved ones. Find yourself a hobby that will absorb you completely. Schedule your day so that there is no time left for empty daydreaming.

Think about what in your behavior drove you away Human A. Learn a lesson for yourself in the future so you don't repeat the same mistakes. Maybe you were too self-centered? Were you little interested in the affairs and concerns of your loved one, did you not pay enough attention to him? Find a quality in yourself that you think could use some work, and get started.

You will need

  • Phone connected to Megafon

Instructions

note

The one-time connection fee is 10 rubles. in view of VAT.
The subscription fee is 5 rubles per day including VAT.

Helpful advice

If, when you connect a hidden call, your number is still detected, this means that the subscriber you are calling has the “Super Caller ID” service activated or the “Show/transmit your number” option is activated in your phone settings. When the Caller ID service is activated, use the call setting “Defined by network”, “Hide number” or “On”. AntiAON."

With the service “Anti-determinant numbers» you can maintain confidentiality during conversations, hide your number even if the other subscriber has “Identifier” installed numbers". By the way, the anti-identifier can be either complete (that is, do not show your number to anyone) or partial (that is, show your number only to a limited circle of people).

Instructions

Some mobile operators provide an anonymity service, and no one will be able to find out the phone number of the caller. For example, MTS has introduced the “Anti-Caller Identifier” service, which allows you to classify your own number through simple steps. To prevent your phone number from being displayed on the recipient’s display, dial the following combination - #31# (subscriber’s phone number) and press the “call” button. This function allows you to remain unnoticed and call your loved ones and friends or complete strangers.
Using this kind of anonymity, no one will be able to find you by . Unfortunately, this service has opened up wide opportunities for scammers and all sorts of adventurers who, under the guise of anonymity, can commit illegal actions such as blackmail, extortion and much more. If such actions have been carried out against you, immediately contact law enforcement agencies, who, after contacting the mobile operator, will find the perpetrators and punish them to the fullest extent of the law.

Allows:

  • see the name or number of the caller on the phone display;
  • set individual ringtones for numbers in your address book;
  • find out the numbers of the last incoming calls - received or missed.

The service is free. For most tariffs it is connected automatically when the SIM card is activated.
If your number does not yet have an identifier, connect it: *110*061# or call 067409061. Connection is free.

AntiAON

Need to hide your number?
Use the Anti-AON (Anti-Caller Identifier) ​​service. It will keep your phone number secret during a conversation, even if the other person has Caller ID installed.

Activate the service on the Beeline website or in any convenient way: call 0674 09 071 or dial *110*071#.
You can disable Caller ID by dialing *110*070#.
You can manage the service yourself. In order for the called subscriber to see your number, just dial the command *31#number of the called subscriber.
In the menu of some phones there is a section through which you can control the anti-identifier. The instructions for the device will help you find it.

FAQ

How can I determine which network and region a number belongs to?

Use the Long Distance Directory service, which will tell you for free where the phone number you are interested in is registered.

How to determine a hidden number?

You can identify a hidden number if you have activated the Super Caller ID service. Activate the service on our website or in another way:

  • by calling 0674 41 61;
  • using the command *110*4161# call.

After connecting the service, all hidden numbers of callers will be detected. You can disable the service on our website or in any convenient way: by calling the number 06744160 using the command *110*4160# call.

The AntiAON service does not work for me! Why?

For the anti-licenser to work, you must:

  • activate the service: *110*071# call;
  • check if the service is activated on the number *110*09# call;
  • check the balance is positive *102# call;
  • if the balance is zero or there are overdue bills, then top up the balance (for prepayment) or pay the overdue bill (for postpayment);
  • check that in the phone settings (in the “Settings” / “Call mode settings” menu) the option to share your number is set to “No” or “Do not tell anyone”.

I'm being bothered by calls from a certain number, can I block this number from calling my phone?

You can use the “Black List” service, which blocks calls to cellular, city, long-distance and international numbers (including telephone numbers of fixed communication networks).


“Why aren’t the numbers identified?” is one of the most frequently asked questions regarding the contact book in Nokia smartphones. As usual, this is due to the peculiarities of the “successful” implementation of certain functions in these devices.

This text opens a series of articles describing user problems of this kind, because it is no longer possible to answer such questions once a day.

The essence of the problem

Let's take any (well, almost any) phone with an empty contact book. Let's insert a SIM card into it, on which there are records (to simplify, only four records were created, that is, four contacts, one number in each). Let's start using the phone. When making a call, the subscriber's name will be determined if it is written in the book on the SIM card (and, of course, the number identification service is activated and works as expected). In general, some devices will show only the name, some will show both the name and the number, depending on what kind of phone we took.

Now consider the “problem” situation. Experience shows that a sufficient number of users manage to create duplicates in the entries on the SIM card - sometimes the same number is recorded three times. There are a lot of reasons for this: they renamed it on the PC, then synchronized it, forgot whether the number was there, and just in case they asked and recorded it again - no matter how exactly the duplicates appeared in the records. The main thing is that phones (and smartphones) handle the presence of duplicates quite adequately. Let's take, for example, Nokia 5300 (here, I had it on hand): if there is a duplicate, the first one is determined from the list, the rest below are ignored, and the name is displayed correctly. If there is a copy also in the phone’s memory, then it is given priority. And in Sony Ericsson, for example, in the case of a double, the last option is taken if you are working with a book on a SIM card (if on a phone, then the first).

Sometimes users accidentally track this nuance: for example, they just wrote down one name, but another one was determined. They start to look into it and see that they are recording it, it turns out, for the second time. But in most cases, they don’t even notice that there are duplicates hidden in the recordings.

The vast majority of other models of mobile phones and smartphones behave in a similar way (as in the examples above), only the selection method differs (from the end or from the beginning), and the reaction to changing the way the code is written - the same “+7” in many devices has priority over “8”, that is, the match will occur more likely with the subscriber for whom the number is written as “+7xxxxxxxxxx” rather than “8xxxxxxxxxx”. But not at all in smartphones based on the Series60 (now S60), the vast majority of which are Nokia smartphones.

What is the “beauty” of the “solution” used here? So, given: a SIM card with contacts and a “clean” (at least with an empty contacts book) Nokia smartphone. As soon as the smartphone senses a SIM card that it has not seen before, it offers to copy all contacts from the SIM card to the phone's memory.

Let's say the user doesn't want to copy contacts. That is, he wants to use the contacts on the SIM card. Here the first catch awaits him: smartphones on the S60 don’t really want to work with entries on the SIM card, and the name will not be determined at all. Having swallowed the insult, having previously guessed (without the help of the manufacturer!) about the causes of the problem, the user decides: “okay, I’ll copy the contacts to the phone’s memory, what can you do?” Goes to the menu, finds the “Contacts on SIM” item, selects everything, copies it to the phone’s memory. It would seem, “Hurray!”

However, not for everyone. Those who happen to accumulate a collection of duplicates will have to be touched a second time: the names again are not detected, the smartphone stubbornly writes a number instead of a name. But the thing is that smartphones on the S60 and in the phone’s memory have not learned to process duplicates (this has happened for so many years!): if there are duplicates, the name will not be displayed, only the number.

Problem Summary

This problem is well known to former Siemens SX1 owners; There is probably not a single nuance inside this device that they have not studied thoroughly. But that was a long time ago, and now there is an opinion that the main reason is the presence of duplicate numbers from the contact book on the SIM card; the option suggested itself. However, due to the excessively frequent questions on this topic, a number of demonstrative experiments were finally carried out to demonstrate that the numbers on the SIM card do not affect anything at all, and duplicates need to be looked for only in the phone’s memory. That is, the SIM card is directly related to the problem, but the contacts stored on it do not aggravate the problem.

By the way, this is not the only way to create duplicates. The second method, for example, is careless handling of the “Copy from/to memory card” function (starting from Symbian 9.1). The third is inaccurate synchronization with MS Outlook. So there are many options.

Solutions to the problem

So, having realized (again, not at all with the help of the manufacturer) the causes of this second problem, the user, of course, begins to get nervous. Having realized that he needs to look for duplicates, he begins to look for ways to do it faster. In the smartphone itself, of course, there is no search by number. The exception is those models in which the “Nokia Search” utility is installed by default. And if it is not there, you should install it (see below for an example of the action). Therefore, all methods of eliminating this trouble are exclusively third-party. We will list some of them.

The first, the most primitive, but the most inconvenient and perhaps the longest: remove the duplicate contact (or replace the numbers in the number), dial the number manually. And if the name is not determined, go back to the contact book, look for a duplicate with your eyes, delete or change the number, dial again manually - and so on, until the number is finally matched with the name.

This method is not the most fun. But there are others. For example, use the “Nokia Search” utility (or download and install it if it was not there initially). The number must be entered completely, with signs and code, otherwise the numbers will not be found. When writing the article, this method was accidentally overlooked, but our readers acted quickly and skillfully :)


An alternative option is the Search app, another variant of the Nokia Search app. Also from Nokia, it is already pre-installed somewhere, and will also go where “Nokia Search” is not installed or where it does not work for a number of reasons. Moreover, this application is capable of searching for any occurrence in a number, that is, it is not necessary to write the number from the beginning and with codes. Perhaps this is the most successful option for searching for duplicates among numbers, since the code becomes unimportant (why this is good - see the next paragraph of the article). What’s interesting is that “Nokia Search” can also search by occurrences, but not everywhere; in contacts - he doesn’t know how.

You can install the ALON Contact Guide program. Hidden in it, in the jungle of the menu, is the useful “Search by Number” function. The disadvantage of the search is the same as that of “Nokia Search”: it searches strictly by the specified number, masks are not supported. As a result, you have to search by both “+7” and “8”.

You can use the SkyeQuiKey program, it will work on the same principle. True, here too you need to take into account that the search is carried out only from left to right, that is, the code will need to be typed correctly.

Another option, also quite interesting, is to leave the duplicates alone and install the FSCaller program (a program for displaying full-screen photos during calls). It was discovered that this program does not care how Nokia processes the incoming number. However, it does not solve the problem described in the next paragraph of the article, and even on the contrary, it still introduces confusion.

Or you can check your contacts in MS Outlook after synchronization. The inconvenience is that you need to have a PC at hand, install synchronization software, connect via cable or something else, and in general, you don’t always want to use the mentioned programs.

Continuation of the problem

The case is rare, but demonstrates the second side of the problem. Let's say our hero overcame all the difficulties, killed all the takes, cleaned everything up, checked everything ten times, and the name doesn't matter is not mapped to a number. What's the problem this time? Here's what. S60 smartphones are not content with little! They immediately take the bull by the horns. And they do it this way: they do not feel any difference between the numbers “+7 xxx 1234567”, “+7 yyy 1234567”, “8 zzz 1234567” and “8 sss 1234567”. That is, for them the number “+7 916 1234567” is identical to, say, the number “+7 903 1234567”. Let’s say even more: in fact, Nokia smartphones don’t give a damn what code is written, since The number is determined using the last seven digits. Let’s check: instead of the number: “+7 903 189 25 87” we write “+9 999 189 25 87”. And what? When you call, the number is determined and the name is matched. The correct number is recorded in the log. In general, it’s rare when seven digits match but the codes are different, but it does happen.

It would be nice if this happened seven or eight years ago, and even from some “Korean” like VK Mobile, one of the first, but for Nokia, yes today, and in the Nokia E90 device (in others, of course, too) - it’s simply indecent . Let’s make sure that this is a quirk of S60 smartphones: let’s look at the reaction of other phones to such numbers.

Tested: Nokia 8910i, Gigabyte g-smart i, Sony Ericsson M600i, Nokia 5300, Sony Ericsson W710i, Qtek 8300 - all are in perfect order, numbers are determined as expected. Of course, we will not check everything available for sale. However, if you come across a device that behaves incorrectly in this situation, contact us, we will be grateful for this information.

Tested: Nokia E50, Nokia E61, Nokia 5500, Nokia E90, Nokia E51, Nokia N82, Siemens SX1 - all have such wonderful license plate recognition behavior. Again, not the entire model range has been tested, but Siemens has also been included in it, and to clear our conscience, we will later check some Samsung models on the S60 platform, since the investigation of the issue has begun. Again, any information on this would be greatly appreciated. Thanks to the efforts of our readers, this list has been supplemented with the Motorola V360: the number is also determined by the last seven digits. Additionally (just to complete the picture, of course, we don’t expect any of the devices to suddenly work as expected) Nokia N73, Nokia 6290, Nokia E70, Nokia 5700, Nokia 6600, Nokia 7650, Nokia 6680 and Nokia 6120 were tested - situation the same.

Pros, disadvantages, conclusions

Skeptics will say: you see, they’ve blown the problem out of the blue. I would not say that the situation is so level: a person switching from a regular phone to an S60 smartphone will think for a long time about where and what the mistake is, especially since many subconsciously expect problems from smartphones. In general, Nokia, having practically crushed the S60, could have already strained its programmers after so many years of the platform’s existence so that this issue could be resolved.

In short, the contact book in your S60 smartphone will not give you such a surprise if you are very careful and attentive, and there are no duplicate numbers among your entries. And if you encounter it, be patient and spend an hour to put your notes in order - at least in the way that smartphones on the S60 understand it.