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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 no: : *#06#
Reset to factory settings : *#7780#
Clear the LCD display (operator logo) : *#67705646#
Bluetooth device address : *#2820#
Sim clock status : *#746025625#
Default Security Code : 12345
On Enhanced Full Rate Codec : *3370#
Off Enhanced Full Rate Codec : *#3370#
On Half Rate Codec. : *4720#
Off Half Rate Codec : *#4720#
Software Version : *#0000# or *#9999#
Display the MAC address of the WLAN adapter : *#62209526#
(Available only in newer models that support WLAN like N80)
Lock Status of ur Phone : #pw+1234567890+1#
Lock Status of ur SIM : #pw+1234567890+4#
Security Code of ur Phone : *#2640#
Game Score & Timer: *#73#
Delete the contents and code of wallet : *#3925538#
Master Code generated from IMEI : 1234567890
Lifetimer : *#92702689#
Provider lock status: #pw+1234567890+1
Network lock status: #pw+1234567890+2
Provider lock status: #pw+1234567890+3
SimCard lock status: #pw+1234567890+4
Reset security code : *#7328748263373738#
Enjoy dudes..
