Jim,
It's a Motorola Z2 Force........it has a nice camera. It does 1080p at 120fps. It'll do 240fps but only at 720p. I use an App called Open Camera, which allows for locking the focus on the reticle......the built-in camera on this phone doesn't have a focus lock feature. The App is really nice as it's free and there are no ads. I donated some funds to the author being the App is so nice and I've used it so much.
There are a couple of new phones that do 240fps and higher at 1080p I think. I just don't know how picky they are with recording. I'm trying to hold out for the new Side-Shot mount that accommodates a GoPro. This will make for a tidier setup instead of having the big phone on the scope. Also it will allow for use of the ballistics calculator I used on my phone without having to exit the App to use it and then go back into App to record. That's a pain.
I have an old stand alone phone that I try to remember to bring with me with the calculator on it but I usually forget.