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Nokia 6230

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Enhanced Full Rate Codec

Jan 10, 2005, 1:11 PM

I have a Nokia 6230b (US version) and I'd like to utilize the EFR (Enhanced Voice) function on my phone. I read somewhere that u must enter the *3370# command to activate it. However, it does not work on my phone. Is this a carrier limitation (Cingular) or firmware limitation? My phone is unlocked and firmware version is 4.28 Thanks in advance for your responses.

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