Two ways to give this
Certificate ($24.99): they pick the case. Best if you do not know the phone or the art.
Pick a case now: only if you know the exact model. Check Settings → About.
The phone is new. They have no habit yet. A slim adult case fails in a backpack. Let them pick the art so the bumper stays on.
Buy a gift certificate → Print a certificateCertificate ($24.99): they pick the case. Best if you do not know the phone or the art.
Pick a case now: only if you know the exact model. Check Settings → About.
