USBfever company introduced the Dual SIM Adapter Shell Case for Apple’s smartphone to feature an additional sim slot.

This accessory not only gives you dual sim advantage but also helps against scratches and allows the use of two sim normal size simultaneousness (yes without any cutting to sim).

However , It is important to note here that only one SIM active at a time like on Nokia phones C1 -00 that appears in the U.S. Users can switch easily through applications and without opening their iPhone case.

USBfever product works good with suitable IOS operating system version including 4.0.0 , 4.0.1 , 4.0.2 and costs about $ 30.

(source: denthan)