Press *3370# to access reserve mobile phone battery power

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You can press *3370# to access reserve mobile phone battery power.

Answer

Apparently the code *3370# activates the Nokia Enhanced Full Rate Codec (EFR), this means that the Nokia cell phone has better sound quality, but with a shorter battery life.

To disable this (EFR) feature, the code is *#4720# which reduces voice quality but enhances battery life.

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