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Easily find out the owner of an unknown cell phone number

From TECHBOOK | December 18, 2020, 1:54 p.m.

Are you annoyed by unknown cell phone numbers on your smartphone? TECHBOOK shows which tricks can be used to easily find out the name of the caller.

Another unknown caller on your smartphone? That can be quite annoying: Is it maybe a friend with a new number - or is it just the annoying hotline employee of the mobile phone provider who wants to advertise a new contract? Even worse: Perhaps a stalker, the tax office or a club acquaintance who has already been suppressed will ring. Don't worry: it is possible to find out the identity of the caller from the mobile phone number.

Phonebook with reverse search

A good first point of contact is the reverse phone book search in the online phone book: Here you can simply enter the number and the owner of the corresponding telephone connection is displayed - at least if he / she agreed to an entry beforehand. A suitable app is, for example, “Das Örtliche Telefonbuch für Deutschland”. The application is intuitive and the database is quite comprehensive - at least if it is a German number.

Find people via WhatsApp

The WhatsApp messenger can also help to assign an unknown cell phone number: Simply save the unknown number in the phone book of your smartphone. If the caller has a WhatsApp account, you will automatically find them there under “Contacts”. A profile picture or the status can perhaps provide information about the identity.

Call mailbox

If this is still unsuccessful, a call to the mailbox may be able to provide clarity - the caller may have set up an individual announcement for his smartphone mailbox. There is a way to call voicemail directly without it ringing first. Each provider has a corresponding code that is provided when dialing between area code and number. At Vodafone, that's about that 50, T-Mobile has that 13 and O2 the 33. You can see which provider the caller is with from the area codes, which are distributed as follows:





O2 (and E-Plus):


If a call comes in with the number 01520-1234567, you know that he is a Vodafone customer. If you want to call the mailbox, insert the number 50 and call the following number: 01520-50-1234567. This also works if the owner has taken his number from one provider to another. So if, for example, the cell phone number you want to check belongs to Vodafone according to the area code, but now uses a telecommunications contract with the same number, the call is automatically forwarded to the mailbox.

Note: Caution is advised if none of the common numbers were used for the call. Unless you have dear relatives or friends overseas - which would explain a foreign number and make it easier to identify - you should be careful that it might not be a payment trap.

Also interesting: TECHBOOK explains how you can easily mute calls from strangers on your iPhone

Use google search

Of course, you can also simply enter the number on Google as a test - but you should keep a few things in mind. Make sure you enter the number in quotation marks (“”) so that Google only searches for this specific sequence of numbers. Perhaps you will find such a company to which you can assign the number. On sites like “Tellows” you can also enter the number and see whether other users have already complained about spam or rip-offs and tell who is behind the number. Then you at least know that you can save yourself the call back.

Be careful with CallerID sites like "Opencnam"

Another point of contact are CallerID sites such as Opencnam: If you enter a telephone number here, the site will in the best case actually spit out a name for it. TECHBOOK has tested it in the past with several numbers - and was surprised: Although there was not a result for every number, it actually worked for some, both first and last name were correct. Kind of creepy - but also useful.

However, the whole thing should be treated with caution! Portals like t3n or bento report cases in which the site even spit out people's nicknames and place of residence. This is because the operator of the site uses data from telephone providers.

If you still have no clarity and feel harassed by the caller - TECHBOOK gives tips in the following article on how you can easily block annoyances.

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