Phone Tips: List Of Nokia Secret Codes

These Nokia codes will work on most if not all Nokia Mobile Phones,Code
Description
*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.

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