How to restore invalid imei

Hey guys whats up there? If you have put a new stock ROM onto your mobile and haven't take up the backup then you will see that there will be the invalid imei number written then what will you do? It will block up your phone sim and wont allow you to call anywhere and not for a particular sim but to all sim there. So in that situation what you need to do is very simple though the problem is complicated.  You need to download an app named as "chamelephon" from the playstore and install it. After installing  it, there you will have to fill up your imei number and if you don't know it then check out the imei number at the back of the battery. Only if the battery is non removal and if a battery is removal then you can see it after removing the battery note down it carefully. You have to fill up your imei in a correct  sequence order as per written imei 1 and imei 2. Finally after doing all this things apply on new imei. Then you need to just power off your phone and start it up now your imei is restored and the sim card is detected by the phone. In this way you can restore your imei.
      
      Well this techniques works for all the android devices it is very easy to carry out this solution and it will also give you effective result and also consumes less time so by this method you can restore your lost imei.

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