I spent a few hours watching my phone on a recent flight before and ended up with a sore back from looking down at my phone for so long. That’s when I got the idea to make some kind of a phone holder hanger that would attach to the seatback tray table when it’s folded up.
But of course someone has already done it.
The good news is that there are a few different approaches to the scenario so you can pick your favorite. I used this Unitron World model on my flight to and from Israel and loved it. It worked quite well on all the flights I was on and it made it a lot easier to power through 34 hours of flights. They’re fairly inexpensive it’s not a huge deal if you want to try a couple different versions, but I really liked how solidly this one held my phone at any angle and how small it folded up.