PIN code, PUK code, IMEI code, the codes of your phone to know

PIN code PUK code IMEI code the codes of your phone to know
PIN code PUK code IMEI code the codes of your phone to know

Last updated: September 24, 2023

To protect your phone, it is better to know a few codes such as your PIN code, your PUK code and the IMEI code .

So, if you are not sure what these codes correspond to, we suggest you take a look in this article. Thus, at the end of this one, you will become unbeatable on the subject and also know some small details which can clearly be important at the level of the security of your smartphone.

PIN code

Let's start with the one you know, the PIN code or Personal Identification Number. Indeed, it is among the codes, the one that you will be able to use most often, although in recent years, it may not be as frequent as before.

Pin code

Indeed, there are several explanations for this. The first is that the PIN code, this is the code that will allow you to unlock sim card your mobile phone, allowing you to make calls or tosend text messages for example. Composed of four digits, it is requested each time you switch on your mobile phone.

Information : by default, the PIN code is 0000. We recommend that you personalize it the first time you use your phone because it is the first code a thief will try after having stolen your phone.

Moreover, be careful at the same time not to forget this code by not typing it.

Whether it's face recognition, fingerprints or a code, you can think you're safe. But keep in mind that this is another security that is better to use.

So avoid as much as possible to take the same code between your phone lock and the PIN code or risk making life easier for hackers. Also, do not put too obvious things like your year of birth or 4 times the number 1.

The PUK code, a backup system for the PIN code

The PUK code  ("Personal Unblocking Key" or unlocking code) is a little less known, but if you do not remember your PIN code at any time, it is surely this PUK code that your phone then asked you for.

This is indeed requested after you have failed three consecutive attempts to enter your PIN code. The SIM card will then be blocked, but this is not final, fortunately for you.

Indeed, to make sure not to completely block access to the telephone to a person who has simply forgotten their code, there is therefore this famous PUK code which is sort of a catch-up code.

It is composed of 4 to 8 digits.

To find it, nothing too complicated, you have two options available to you. The first is to find the mail that came with the SIM card when it was given to you. You will find the PUK code systematically indicated above.

PUK Code Sim Card

If you have lost it, you will have to contact your operator. To do this, go to the store with your identity card. If you are not the holder, for example a parent, he will also have to travel with his identity card.

If you can't get around, then take a look at this article: Lost PUK code: what to do?

Please note: if you enter ten fake PUK codes, your SIM card will be permanently blocked and you will no longer be able to use it. It is therefore important not to be (too) mistaken by entering this code 10 times in a row.

The IMEI code

If the PIN code is well known and the PUK code not unknown to many people, the following code often means nothing to anyone. In effect, the IMEI or “International Mobile Equipment Identity” code is very, very little used, while it is extremely important!

If we had to schematize its usefulness a little, see this like an ID of your phone.

It consists of 16 or 17 digits.

1200px IMEI

Whenever your phone wants to connect to a mobile network, it will then present it.

When you arrive on your operator's mobile network, it will recognize the IMEI code. Thus, it will allow him to connect, to exchange messages, tocall a phone number and even browse the net.

Except that these interactions, they are hidden. And that explains why you are not aware of this IMEI code most of the time.

But there is a particular case where it is important to know it, that of the laptop theft.

Indeed, if you ever cannot find your phone and want to block it permanently, you can communicate your operator's IMEI code after filing a complaint so that it can be blacklisted in some way.

In this way, this IMEI code is also very interesting when you buy a second-hand phone. Take the reflex to check if the IMEI code of the latter comes from a phone that has been declared as stolen.

To do this, pretend to try it and type directly * # # 06 and search on your phone whether the number that appears corresponds to a stolen phone or not. This will save you a lot of trouble then.


Now you know everything about the different codes that can be found on a phone and as you have just seen in terms of security it is rather well done with each time a connection between these codes and measures to avoid problems.

It is for this reason that it is important to know your codes and not to disclose them to anyone, even your friends. Indeed, you never know what could happen and you will be sorry to lose all your data.

cropped dimitry
Since his childhood, Dimitry has been passionate about video games and new technologies. His dream was to contribute to this fascinating field. Today, this dream is a reality. Dimitry writes for FunInformatique, sharing his passion and expertise with our readers. He collaborates with our passionate team to produce IT guides and resolve technical issues, all in a clear and accessible way for all our visitors.