hi dear mahdavi
im from iran and my brother has 930 also.he has these problem with his smartphone.there is some problem in mic that can record the sound in sound recorder apps.also in conversation in speaker mode, the other side person can not hear you.also you can not talk to Cortana.you can just type in Cortana.we did soft and hard reset but we can,t to solve this problem.
if you and any people have some solution for this problem, send me email plz.it is so vital for me.thank you
******@hotmail.com