Moment offers several tripod mounts compatible with MagSafe-compatible phones, but my favorite by far is the multi-threaded mount. It’s just a flat disc of metal with several holes drilled in it (also why this kind of mount is affectionately called a Swiss cheese plate), and each hole corresponds to a different size of tripod screw.
It’s small enough to stick into any camera kit and versatile enough that I have yet to encounter a tripod I can’t use it with. Once you pop your phone onto the mount, it clings to it with a surprisingly powerful magnetic grip. It’s just an excellent tool to have on hand, and I’ve used it way more than I thought I would. It has worked for everything from stabilizing my phone for video calls to turning my phone into an “emergency” backup low-light landscape shooter–when I forgot to charge my camera batteries before going on a scenic walk on the beach.
This one is specifically for use with Apple’s MagSafe technology, but Moment offers a number of MagSafe adapter cases for Samsung, Pixel, and OnePlus Android phones.