Show identity - *31#9XXXXXXX
Hide identity - *30#9XXXXXXX
Default security code - 12345
*#06# - IMEI numbers.
*#0000# - Firmware version.
*#92702689# or *#war0anty# - shows phone manufacture date, Serial, IMEI, Purchase date, Last Repair Date.
*#2820# - Bluetooth info.
*#7370925538# or *#res0wallet# - Reset all the Wallet contents and the passwords.
*#335738# or *#delset# - Delete Email, GPRS, MMS settings that cannot be erased via phone options.
*#7370# - Format phone completely.
*#7780# - Restore Original Settings
*#62209526# - WLAN MAC address.
*4720# - activate Half Rate Mode.
#4270# - deactivate Half Rate Mode.
*3370# - activate Enhanced Full Rate.
#3370# - deactivate Enhanced Full Rate.
#746025625# - Newer SIMs have a feature called 'clock stopping' that allows the phone to save energy. It is a kind of sleep mode for SIM cards.
