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
*#4720# Deactivate Half Rate Codec
#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
*#4720# Deactivate Half Rate Codec
*#2640# Displays security code in use
*#30# Lets you see the private number
*#43# Allows you to check the \"Call Waiting\" status of your phone.
*#61# Allows you to check the number that \"On No Reply\" calls are diverted to
*#62# Allows you to check the number that \"Divert If Unreachable (no service)\" calls are diverted to
*#67# Allows you to check the number that \"On Busy Calls\" are diverted to
*#67705646# Removes operator logo on 3310 & 3330
*#30# Lets you see the private number
*#43# Allows you to check the \"Call Waiting\" status of your phone.
*#61# Allows you to check the number that \"On No Reply\" calls are diverted to
*#62# Allows you to check the number that \"Divert If Unreachable (no service)\" calls are diverted to
*#67# Allows you to check the number that \"On Busy Calls\" are diverted to
*#67705646# Removes operator logo on 3310 & 3330
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