*#0000# – This shows the current firmware version of your phone software. This way you can assure whether you have the latest firmware version or not.
*#7370# – This is one of the most important secret code as it let’s you hard reset your phone. It’ll bring the software to it’s original state, while deleting all your files. So you should take backup of your files before doing hard reset. The default lock code is 12345.
*#7870# – If you just wish to bring the phone software back to original settings, use this code. It’ll only soft reset your phone.The default lock code is 12345.
*#92702689# – This is called Life Timer. It shows the total outgoing call duration till date.
*#2820# – This shows the Bluetooth address of your phone to manually connect to other Bluetooth devices.
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