A:Answer The JOBY GripTight ONE MOUNT will NOT hold a device that is 5 1/4". Phone (plus case, if you're leaving the case on) must be between 56-91mm, or 2.2-3.6", per the GripTight One Mount package.
The threaded mount is industry standard 1/4"-20 thread, and should work with any standard tripod mount that works with a traditional camera.