The most popular air vent car mount, simple but sturdy.

according to expertreviews

Like many air-vent mounted holders, the Yosh holder comes in two parts. The holder itself slots between the vent blades and you attach a plate to the rear of your phone, which snaps onto the holder like a powerful fridge magnet.
How you attach the plate is up to you: you can use the supplied adhesive pad or slip it inside your shell or case. It comes with a second plate too, so you and a partner can each easily attach both of your phones. It’s a simple and extremely light design but the magnet holds the phone firmly even on bumpy roads.

buy on amazon

Key specs – Weight: 59g; Mounting: Clip to air vent; Colours: Black, grey