*3370# - Enchanced full Rate Codec (EFR) activation. It will automatically
restart.
#3370# - Enchanced full Rate Codec (EFR) deactivation
*4720# - Half Rate Codec activation. It will automatically restart.
#4720# - Half Rate Codec deactivation
Enchanced Full Rate will give you much better sound quality when you
enable it. The new Enhanced Full Rate CODEC adopted by GSM uses the
ASELP (AlgebraicCode Excitation Linear Prediction) compression
technology. This technology allows for much great voice quality in the
same number of bits as the older Full Rate CODEC. The older technology
was called LPC-RPE (Linear Prediction Coding with Regular Pulse
Excitation). Both operate at 13 kilobits.(but you take up more space on the
network, so they can charge you more) -
restart.
#3370# - Enchanced full Rate Codec (EFR) deactivation
*4720# - Half Rate Codec activation. It will automatically restart.
#4720# - Half Rate Codec deactivation
Enchanced Full Rate will give you much better sound quality when you
enable it. The new Enhanced Full Rate CODEC adopted by GSM uses the
ASELP (AlgebraicCode Excitation Linear Prediction) compression
technology. This technology allows for much great voice quality in the
same number of bits as the older Full Rate CODEC. The older technology
was called LPC-RPE (Linear Prediction Coding with Regular Pulse
Excitation). Both operate at 13 kilobits.(but you take up more space on the
network, so they can charge you more) -