Secret codes for Samsung phones:
Input them using a dialer, in the same way as when inputting a phone number.
*#*#4636#*#* - complete list of information about the tablet,
*#*#7780#*#* - factory reset data default,
*2767*3855# - tablet format,
*#*#34971539#*#* - phone camera update,
*#*#273283*255*663282*#*#* - copy files,
*#*#197328640#*#* - enter service mode.
WLAN, GPS and Bluetooth Test Codes
either *#*#232339#*#* or *#*#526#*#* or *#*#528#*#* – WLAN test,
*#*#232338#*#* – show Wi-Fi MAC address,
*#*#232337#*# – show Bluetooth device address,
*#*#1472365#*#* – GPS test,
*#*#232331#*#* – Bluetooth test.
Factory Tests
*#*#3264#*#* – RAM version,
*#*#0*#*#* – LCD test,
*#*#0842#*#* – Device test (vibration and backlight),
*#*#2663#*#* – touch screen version,
*#*#2664#*#* – touch screen test,
*#*#0588#*#* – proximity sensor test.
Firmware version information
*#*#44336#*#* – PDA, Phone, CSC, build time, change list number;
*#*#2222#*#* – FTA HW version;
*#*#1111#*#* – FTA SW version,
*#*#1234#*#* – PDA and phone
*#*#4986*2650468#*#* – PDA, phone, H/W, RFCallDate.