A new case/device has been launched by the makers of the Peel iPod phone adapter called the Vooma Peel PG92. This case, when attached a jailbroken iPhone 4 or 4S adds dual SIM capabilities to it. The device also has a back-up battery that can charge your phone.
So a big case for the iPhone that charges it, unlocks it, and enables dual SIM capability. Now that’s SWEET! You can get more information about the case and the app by registering over here.