I commute via NJ Transit and I like to watch movies during my ride. This easy, no sew, seat mount won't work for every bus seat but it works for NJ Transit.
Step 1: You'll Need 12 Gauge Clear Vinyl and Sticky Back Vinyl
Wrap the vinyl around your phone so that it overlaps on the back of the phone. For the iPhone SE I cut a piece of vinyl that was 7.5" x 5".
Step 2: Add the Velcro
With the vinyl wrapped around the phone, position the velcro so that the vinyl will fit snugly around the phone.
Step 3: Add Mounting Strips
Velcro has 2 sides. There is the pointy side and a soft side. Add 2 strips of the pointy side to the back of the closed phone mount. This is what will allow your phone to stick to the seat back in front of you.
Step 4: Optional Step - Add Hot Glue
To keep the phone from sliding out of your phone mount, you might want to add a little hot glue to the folds in the vinyl. Allow the glue to dry completely before using your new phone mount.
Step 5: Test It Out!
The next time you're on the bus, wrap the vinyl around your phone and enjoy a movie!