The ST-03 Folding Smartphone Tripod Mount from Ulanzi is a truly portable smartphone mount for 1/4"-20-compatible tripods or handgrips. It holds your smartphone in a landscape orientation and features a hidden cold shoe mount. The cold shoe is milled into the all-aluminum body and lets you add additional accessories, such as an external mic or LED light.
This tripod mount folds flat for easier transport in a bag or pocket, to me ready at a moment's notice. To use, just unfold the top and bottom grips that are lined with rubber padding. The center stainless steel thumbscrew adjusts the mount to hold smartphones from 2.6" to 4.1" wide.