I have an Iphone 6 Plus with updated software IOS 10.3.3.
In the last week or so from what i can remember, people i've rang and put on loud speaker, have said that they cannot hear me or that i'm cutting out. I recently tried to video record from the front camera, when i went to watch the video, all I could hear was like a static background kind of noise. When i take a video of me speak loudly into the front top speaker which is for front facing videos, i can only very slightly hear my voice. I then recorded a voice memo and switched the recorded memo from speaker to normal, both worked fine. I then decided to do a video using the back camera, that works fine. I've done a hard reset, reset my settings, factory reset, turned the phone off and took the sim card out and then put it back in and rebooted the phone. Nothing has worked!! I don't have any warranty on my phone, and have spoken to customer service online and they said it maybe a hardware issue, and that i need to go to apple directly and get my device serviced.