The Arca-Standard Phone Support with Cold Shoe Mount from SmallRig allows you to mount your smartphone onto a DJI RS 4 Mini or RS 3 Mini gimbal using an Arca-type plate. The integrated Arca-type plate secures onto the gimbal's Arca-type receiver, and it features an integrated shoe adapter on the bottom so you can also mount your phone onto any cold shoe.
The phone, such as a later-model iPhone, mounts onto a MagSafe magnetic mount and supports loads up to 1.1 lb. There is also a cold shoe on the mounting arm for an additional accessory.