Peel has shown the Vooma Peel PG92 that works with a jailbroken iPhone 4 or 4S and offers the ability to use two SIM cards simultaneously, using an unofficial app to control them.
The Peel case overcomes two of the difficulties with the latest iPhone models — the problem of a permanent, untethered unlock and the need to constantly swap out SIM cards as one passes back and forth between countries. The case, which also provides a battery pack.
