AT&T Samsung Impression Tricks:4 steps to increase the volume for calls with receiver and speakerphone
Some AT&T Samsung Impression users said the phone’s volume for calls is not loud enough, so that they can not hear clearly, we found the tutorial for who want to increase the volume for calls with receiver and speakerphone on AT&T Samsung Impression,there is an easy way to do it, we had tested this way really works and works well.AT&T Samsung Impression info
How to increase the volume for calls with receiver and speakerphone?
For earpiece in a call
enter *#197328640# like you were making a call.
tap 8 - audio
tap 1 - RCV Config
tap 3 - Call config
tap 3 - RCV Codec Gain
tap 4 - cod_rx
Then enter your selection for the gain by tapping on the number. 4 would be a decent choice.
Then hit the end call key. Reboot your phone and try it out.
If its too loud then try 2 or 3. Not loud enough try 5 or 6 but your receiver speaker may start to distort
NOTE:F.Y.I. the default value for cod_rx for each is 0db.
For speakerphone
enter *#197328640# like you were making a call.
tap 8 - audio
tap 3 - Spk Config
tap 3 - Call config
tap 3 - Spk Codec Gain
tap 4 - cod_rx
Then enter your selection for the gain by tapping on a number. 4 would be a decent choice.
Then hit the end call key. Reboot your phone and try it out.
If its too loud then try 2 or 3. Not loud enough try 5 or 6 but your speaker may start to distort.
Thanks the samsung impression forum sharing the tricks. hope this helpful!

