All Mobile devices have secret codes for testing necessary function is working correctly or not? You can also manual check about your phone qualify and all function working correctly.

Phone Secret Code app collections of Categories are below and provide all this Topic Like,
Android Secret Code
SAMSUNG Mobile Code
LG Mobile Code
MICROMAX Mobile Code
HTC Mobile Code
OPPO Mobile Code
MICROSOFT Mobile Code
NOKIA Mobile Code
MOTOROLA Mobile Code
HUAWEI Mobile Code
LENOVO Mobile Code
ASUS Mobile Code
ACER Mobile Code
ONEPLUS Mobile Code
BLACKBERRY Mobile Code
VIVO Mobile Code
Etc...

Secret Code for....
1> Phone information
2> Battery information
3> Battery history
4> Usage statistics
5> Wifi information

Secret Code for....
1> Update camera firmware in image (Don't try this option)
2> Update camera firmware in SD card
3> Get camera firmware version
4> Get firmware update count
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