Samsung
*#06# -IME number
*#9998*746#-sim info
*#0*#-test mode
*#1234#- sofware version/current
*#*#4636#*#* - diagnostic/general settings
*#9998*4357#- help menu
*#9998*5282# - java menu
*#9998*636# - memory status
*#0011#- service menu
*7465625*638*#-configure network loock MCC/MNC
sony
*#*#2222#*#* -FTA H/W version
*#*#1234#*#* - PDA /phone firmware info
*#*#4986*2650468#*#* -PDA/phone H/wRF call date firm ware info
*#*#7262626#*#* -Field test
*#*#232331#*#* - bluetooth test
*#*#0588#*#* - proximity sensor test
*#*#1575#*#* - different GPS test
*#*#1472365#*#* -GPS test
*#*#232339#*#* - Wireless lan test
OPPO
*#1234#- software info
#800# - engineering mode
*#801#- engineering mode (danger)
*#802#- enter AUTO enginering TTFF GPS test
*#803# - engineering network test
*#806# - test mode
*#36446337# - function mode test
others:
*#*#34971539#*#* -reinstal the phone software
*#*#273283*255*6623282 -quik backup of files
*#*#0*#*#* -LCD test
*#*#0824#*#* - audio test
*#*#0283#*#* - LOOP BACK TEST
NOTE: it will be depend on the model,version,network,OS structure of the phone some codes is not working on other phone only test on phone brands and models
*#06# -IME number
*#9998*746#-sim info
*#0*#-test mode
*#1234#- sofware version/current
*#*#4636#*#* - diagnostic/general settings
*#9998*4357#- help menu
*#9998*5282# - java menu
*#9998*636# - memory status
*#0011#- service menu
*7465625*638*#-configure network loock MCC/MNC
sony
*#*#2222#*#* -FTA H/W version
*#*#1234#*#* - PDA /phone firmware info
*#*#4986*2650468#*#* -PDA/phone H/wRF call date firm ware info
*#*#7262626#*#* -Field test
*#*#232331#*#* - bluetooth test
*#*#0588#*#* - proximity sensor test
*#*#1575#*#* - different GPS test
*#*#1472365#*#* -GPS test
*#*#232339#*#* - Wireless lan test
OPPO
*#1234#- software info
#800# - engineering mode
*#801#- engineering mode (danger)
*#802#- enter AUTO enginering TTFF GPS test
*#803# - engineering network test
*#806# - test mode
*#36446337# - function mode test
others:
*#*#34971539#*#* -reinstal the phone software
*#*#273283*255*6623282 -quik backup of files
*#*#0*#*#* -LCD test
*#*#0824#*#* - audio test
*#*#0283#*#* - LOOP BACK TEST
NOTE: it will be depend on the model,version,network,OS structure of the phone some codes is not working on other phone only test on phone brands and models