After 15 days of use on my iPhone 7, in the middle of a call, while simply sitting at my desk, the other party suddenly asked me "did you go outside?" Within another 2 minutes, I became completely unintelligible, though I could hear the party I was speaking to with 100% clarity. We ended the call and I called back, thinking it may have been a poor connection, with the same result. Changed locations to ensure it wasn't a bad cell tower, same result. Took the phone back to Best Buy, where the Geek Squad ascertained it was indeed a defective speaker. However, Best Buy/AT&T's policy is to only exchange phones for 14 days. As this was day 15, they wanted to send it out for service. I don't know of anyone who is willing to be without a phone for days on end. I called Apple from the Best Buy parking lot and the CSR was extremely helpful, getting me an immediate appointment at the Apple Store, even though they did not have any appointments at the store for another five days. Got to Apple and after waiting less than 5 minutes, Genius Bar rep was able to see me, run diagnostics on the phone, and swap it out. Lesson learned--I'll never buy another phone from the Best Buy Store again and will simply go straight to the Apple Store to save a lot of time and frustration.