Nokia Mobiles Cheat codes and tricks

3370# Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%

#3370# Deactivate Enhanced Full Rate Codec (EFR)

*#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time

*#4720# Deactivate Half Rate Codec
*#2640# Displays security code in use

*#30# Lets you see the private number

*#43# Allows you to check the \"Call Waiting\" status of your phone.

*#61# Allows you to check the number that \"On No Reply\" calls are diverted to

*#62# Allows you to check the number that \"Divert If Unreachable (no service)\" calls are diverted to

*#67# Allows you to check the number that \"On Busy Calls\" are diverted to

*#67705646# Removes operator logo on 3310 & 3330

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