So you would like to mount your smartphone to your tripod to capture better photos and video? The Ulanzi ST-03 Metal iPhone Tripod Mount has you covered. It has a T6061 aerospace aluminum alloy construction and a cold shoe mount for attaching your microphone and LED video. It features an Arca-style quick release plate.
This iPhone tripod mount can accommodate smartphones from 2.28″ to 4.1″ wide, up to 7″ screen size. Costs around $15 at the time of this writing.[where to get it]