Gail has an iPhone 4 and she's looking to upgrade to the iPhone 5s. How much storage should she get in it? Leo says the iPhone comes in 16GB, 32GB, and 64GB with $100 bumps each way. If her current phone is 16GB and she's not deleting stuff to make room, then a 16GB is just fine. If she can swing the extra $100, she should get a 32GB just to be safe.