i found this interesting picture on one of the site that i visit lol

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Nokia code function *3370# This Nokia code activates Enhanced Full Rate Codec (EFR) – Your Nokia cell 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 [...]

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