When I receive a call on my cell at home, the first 10-20 seconds has a in/out type interuption and finally comes in. I use the AT&T microcell and I just replaced it with no change in the call quality. My mom has the 6S+ and doesn't have this issue. I can only assume it's an issue with the phone itself. I hear complaints now and then that people can't hear me well some of the time. Quantity vs. quality, Apple?