IMEI number
*#06#
Software Version
*#0000#
1st Line - Software Version
2nd Line - Date of Software release
3rd Line - Phone Type.
Serial Number
*#92702689#
1st Screen - Date of phone manufacture
2nd Screen - Serial #, IMEI
3rd Screen - Purchasing date
4th Screen - Last Repair Date.
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*3370# to activate Enhanced Full Rate Mode
[Call quality increases, battery life decreases!]
Newer versions of the phone software (probably from version 4.73 onwards, if I'm wrong someone correct me!) have got EFR activated as standard, so *3370# doesn't work. MTN South Africa supports this feature.
#3370# to deactivate Enhanced Full Rate Mode
Note:
After pressing these codes the phone will shut down and start up again with the service activated/deactivated.
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*4720#
Activates Half Rate Mode over GSM (older versions of Nokia 61xx firmware only).
Call quality drops, but increases battery life by about 30%...also network dependent
#4720#
De-activates Half Rate Mode over GSM (older versions of Nokia 61xx firmware only).
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