HT4623 my iphone 4 microphone works ok on voice memos, but will not work on making or answering phone calls.

Just in the last month, I have been unable to talk on my iPhone 4 (32GB). All other functions are ok including the use of the Voice memo App.
I have no idea why the voice App microphone works ok but not to talk to incomming and outgoing phone calls

I'm Updating too 8.2. hope it fixes the issue.
if i know how can i fix this problem...

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