I don't know who's aware of this and who's not, especially because I personally wasn't. I also haven't seen this posted anywhere unless it's just slipped by me. So earlier this morning while on the phone, my display went black. The call was still going but there was no response from the display. I eventually ended the call through my headphones and still no response. I immediately tried to do a hard reset by holding down the home button and the sleep button until the phone reboots. No cigar. I didn't want to resort to restoring my phone through iTunes because it was apparently still working, sounds from notifications were still coming through, it vibrated, and everything else. My next step, unwillingly, was to go to the Apple Store and get it checked out thinking the display just fried or got disconnected from the logic board. I showed up with no appointment and was seen about 30 minutes later. The genius immediately tried to hard reset by holding down the home button and power button and had no luck. After a few seconds of him standing there perplexed, he then said "ahhh I almost forgot- with iPhone 7s it's the sleep button and 'lower volume' button. Don't worry, we didn't know about that either. Apple didn't say a thing and it threw us all off in the beginning." After a few seconds, the white Apple showed up, my phone was good as new, and off I went. Just a little tip that may save you guys sometime, a headache, or even a drive to the Apple Store for a 10 second quick fix.