There are plenty of cheap tripod mounts available for smartphones. Most of them are either flimsy or don’t allow vertical shooting. The Ulanzi HP004 iPhone Tripod Mount lets you shoot any way you like as it allows 360-degree rotation. It has 2 cold shoes and a bottom 1/4″ screw hole. This metal iPhone holder has an Arca mount on the bottom.
The clip can accommodate phones from 2.36 to 3.74″, including iPhone 14 Pro Max to iPhone 6 as well as various Samsung Galaxy models. You can use this phone holder as a selfie stick when extended. There is also a desk mode, so you can use this as an iPhone stand.[where to get it]