SIMPLcase is a unique case that offers a way to store up to 3 SIM cards inside your phone case. The case also holds a SIM removal tool to help you swap SIM cards. Obviously this is not something you might find yourself doing unless you travel a lot, which would make this case pretty convenient. SIMPLcase is available for iPhone 4, 4s, 5, and 5s.
SIMPLcase: http://www.lgcldesigns.com
