iPhone 5 audio problem


Sir,
I have iPhone 5. In which audio problem is there.
1. Speaker & mic not working on calling in normal mode.
2. Speaker & mic not working on calling in speaker mode.
3. Speaker & mic not working on calling in hand free mode.
But speaker, mic & ringer works in voice memo. It records voice it means mic is Ok. We can hear recording on normal ear speaker & on loud speaker, it means speaker & ringer are ok. I sync it with iTunes, check both date & time are ok. I change charging strip with Ok working strip from other working iphone 5. But same issue. Video camera voice is also OK.
Can please help me to solve this problem?
Thank you in advance.