I'm working with a T-Mobile Samsung Galaxy S4 SGH-m919. I am currently on a NB4 Firmware. w NB4 Baseband. Knox Tripped. I went thru a series of Upgrading amd Downgrading via Odin and Kies to get the phone to the status it is now. I have smooth working handheld. The only problem is that I do not have any in call audio. It makes the dialing sound on the dialer and a beep noise to notify that the call goes thru but nothing on the earphone. The call does go thru but silence on both ends. I dont believe its a hardware problem because I ran the test on the Earphone via dialer code. and it made sounds. I managed to make other sounds come out thru the earphone via market apps. Also the microphone does not work using stock apps like google voice, S Voice , Voice Search and Voice Recorder. However, i downloaded a voice recordrr app on Market with the ability to pick which microphone to record from and the bottom mic was recording flawlessly like the camera mic. Is this a software, firmware, rom, radio?, modem? problem. i had no sounds for a while till i flashed the nb4 modem and nonhelos.
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