Thank you Marisha Gordon for this helpful information!
Some rides at Universal Studios, Orlando do not allow the rider to carry any personal items on the ride. This includes cell phones, keys, wallets etc. Before entering the ride que for those specific rides, you will have to walk through a metal detector to insure you have nothing on you. The rides that do not allow personal items do have lockers stationed near the entrance for your use.

There are two sizes of lockers available. A small size and a larger size. The small size can easily fit any loose items from your pockets along with a small bag or an extra jacket for example. If you have a large bag, popcorn buckets, or drink cups and such you will need the larger size locker.

The small size lockers are free to use while riding, the larger size are $2 while you ride.

Tip: each theme park ticket is entitled to one free small locker. If you have lots of small items, and a few guests riding, everyone can split their stuff between lockers.
I'm going to go jump on The Incredible Hulk now! đŸ™‚