Obtain IMEI (Serial) Code: *#06#.

Firmware Version: *#0000# or*#9999#.

View Serial No: *#92772689#.

*3370# To activate Enhanced Full Rate (EFR).

#3370# To deactivate EFR Half Rate Mode (HFR).

*4720# To activate HFR.

#4270# To deactivate HFR.

Default Security Code: 12345 .

#pw+(master code)+Y#
This code is able to check, activate or remove Sim card restriction by using the * key to get the p, + and w chars.
'Y' has to be 1,2,3 or 4 - depending upon which lock you want to deal with.
#pw+1234567890+1# for checking Provider-Lock status.
#pw+1234567890+2# for checking Network-Lock status.
#pw+1234567890+3# for checking Country-Lock status.
#pw+1234567890+4# for checking SimCard-Lock status.

MASTERCODE = 1234567890 (master code) is a 10 digit code, based on the phones IMEI number.