An Apple iPhone book case or iPhone 2-in-1 case provides protection for the front and backside of your device. You can also use an iPhone book case to store some cards and cash in. This means you have all your important belongings at hand when you step out the door. An iPhone 2-in-1 case is a book case, but one with a removable back cover. This is useful if you need to make a long call or have to check your phone often. Fold the front flap of the book case or 2-in-1 case to use it as a stand. Choose an iPhone case that fits your device.