There are a lot of hidden codes you can dial to check and diagnose your mobile phone? Here’s a list of phone codes you can try:
*#06# – check IMEI number
*#*#4636#*#* – phone information, usage and battery status
*#0*# – enter service menu (works on newer phones)
*#*#34971539#*#* – camera information
*#*#273282*255*663282*#*# – backup all media files
*#*#232339#*#* – WiFi test
*#*#197328640#*#* – enable test mode for service
*#*#0842#*#* – back-light test
*#*#2664#*#* – touchscreen display test
*#*#1111#*#* – FTA software version
*#12580*369# – complete software and hardware information
*#9090# – diagnostic configuration
*#872564# – USB logging control
*#9900# – system dump mode
*#301279# – HSPA control menu
*#7465625# – phone lock status
*#*#7780#*#* – reset data partition to factory state
*2767*3855# – format device to factory state
Source:Via
