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All these codes are collected from different sources in the internet. I have tested only some of them. Some of these may not work on all models. So, please try at your own risk.
IMEI number : *#06#
Lock keys : *7 (Press together)
Note : [] (pause) means the * key held in until box appears.
Select phone line : [] [] [] 0 0 8 [] 1 []
(use this 2 write things below the service provider name)
Add phonebook 2 main menu: [] [] [] 1 0 5 [] 1 []
Add messages 2 main menu : [] [] [] 1 0 7 [] 1 []
Copy SIM memory (phonebook menu) : [] [] [] 1 0 8 [] 1 []
Eng Field options : [] [] [] 1 1 3 [] 1 []
Frequency of search menu - Slow : [] [] [] 1 0 1 [] 1 []
Frequency of search menu - Medium : [] [] [] 1 0 2 [] 1 []
Frequency of search menu - Fast : [] [] [] 1 0 3 [] 1 []
Enable EFR (Enhanced Full Rate Codec) : [] [] [] 1 1 9 [] 1 []
Function : [] [] [] # # # [] 1 []
Change pin : [] [] [] 0 0 4 [] 1 []
Unblocking using the PUK code : [] [] [] 0 0 5 [] 1 []
To deactivate any code, change the last no: to '0' (zero).
eg:- To deactivate the code [] [] [] 1 1 9 [] 1 [], type [] [] [] 1 1 9 [] 0 []
Enginnering mode : Enter menu & press 048263* quickly.
To change GSM frequencies to 900/1800 in this menu :
Under "Opcode", enter the foll:
10*0*3 for GSM 900
10*0*4 for GSM 1800
10*0*5 for GSM 1900
10*0*6 for dual band GSM 900/1800
10*0*7 for dual band GSM 850/1900
