Im having the same issue. Woke up one morning tried to make a call no sound so i tried speaker phone its blacked out no mic for calls or siri etc. I can hear voicemails fine on the regular speaker so i know it works i can hear music through apps such as iheart. i tried doing a factory reset still nothing. When i try to restart the phone since i read several places after several restarts it started working it takes forever to start back up stays on the apple logo for quite a while. I am on a very fixed income i cannot afford a new phone right now i really need to find a fix i guess i will try the blue tooth solution for now hopefully thats a temporary fix. If this is such a common problem why wont apple take care of theyre customers who pay outrageous prices for a phone does crying and begging work because i am at that point unfortunately i cant even call apple until i can borrow a phone and the nearest genious bar is quite far on the bus for me. Please help!!!