Review on 🚲 Bike Phone Mount - Stable 360° Rotation Bicycle Phone Holder with 4 Telescopic Arms | Compatible with iPhone & Android (4.5 to 7.2 inches) by Bill Forbis

It attaches securely to the rails but mine does but doesn't work with the battery box and rattles when you hit bumps. For me it was annoying to use on a scooter and swapping out my phone for a thinner case isn't a big deal since most people don't use a battery case, but it did make things a bit more difficult for me. It holds the phone at a good viewing angle. I would love it if they upgraded it so the locking mechanism doesn't rattle, but it's pretty solid and reliable.