Magic Tricks

Yes, have the spectator hold their phone and you can balance something of yours on top of it. This could be a credit card or playing card out of the box, or you could possibly modify your wallet or another card to work with Stasis.

Either the first or second object in the tower needs to be the the magician's, and there is definitely a weight limit to this effect but that limit will depend on you and your handling. You probably couldn't balance something much heavier than a phone.