iPhone 4s mic issues

iPhone 4s 64gb on Telstra

Half the time when i call someone they cannot hear me, i checked the mute button turning it off and on, no difference, also reset the phone etc.Not sure if carrier or phone fault. Seems to only happen with out going calls, happens to home and mobile phones.

Anyone else have this issue or know about it?

Also when taking a photo with the flash, the picture seems washed out with like a whiteneaa