In Nokia phone there are two sound systems called “Full Rate Codec” (High Quality) and “Half Rate Codec” (Low Quality). Full Rate Codec uses more power than Half Rate Codec. Code *3370# enable this “Full Rate Codec” system and *#4720# enables “Half Rate Codec” system. If you type *3370# and send, it enables high quality sounds and reduce your battery power soon. So ignore those useless mails.
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