Will it clamp?

Tray tables

SkyGrip clamps open to the thickness of a seat-back tray. Close them on the thin front edge, not the hinge side.

Phones and cases

Any phone fits the clamp head in portrait or landscape. Wallet cases, ring stands and card holders on the back get in the way — remove them first. MagSafe heads need a MagSafe iPhone or a magnetic ring.

Gym and bathroom

IronGrip needs steel; aluminium frames won't hold it. Wall Hold needs a smooth, non-porous surface.