I've tested the mic using some apps and I can record sound and reproduce it very well, but when I receive or make a call the mic stops working and also the speaker makes a hiss (white noise) with a clic sound every 3 seconds, I can hear the other party but the volumen is very very low even with speaker function or using headphones. I've done a hard reset and the problem is still there. i've flashed it and installed a different version and the same happened. Also I tried a diferent chip and differents providers and the same. so what could it be and how can i solve it?