This hunting is great friend, although its use is somewhat limited, it is necessary especially for iPhone users since they only have the capacity for a Sim with PIECE they could have two SIM cards in your device, although it is an extendable device is very small and You can carry it in your pocket and the best thing is that it is linked by Bluetooth and its price is very low.
Great hunting!
RE: PIECE - A slim and smart device that will help you to use 2 sim