Just to clarify, there are now two "levels" of ride restrictions. The 3 big coasters - Rip Ride Rockit, Hulk, and Dragon Challenge - don't allow anything in your pockets, including cell phones and wallets. They enforce this with visual checks and metal detectors. The other restricted rides - Forbidden Journey, Mummy, Gringotts, Men In Black (I'm sure I'm forgetting a few), won't let you bring bags or large objects on the ride, but things in your pockets (including cell phones, cameras, and wallets) or even a fanny pack are OK.