I often use the gps app on my phone but there is no convenient place to put it in my car. This 3 way phone mount allows me to hang it from the rear view mirror.This phone dock can hold any standard sized smart phone. (But not the huge ones!)InstructionsPrint everything at 30% infill minimum. You don't want your phone coming loose because you decided to save a little plastic!I added the gray weather stripping to the mount to keep the phone from slipping out.