Here's a handy device to cut older SIM cards to fit newer phones, like the iPhone 5.
The Nano SIM Cutter takes any regular or micro size and trims the excess off to provide you a precision cut nano SIM. It's simple, you insert your SIM card with the contacts facing downwards, push the SIM card all the way in, and push down on the lever. The cutter will provide you with a perfectly cut nano SIM card every time! These Nano SIM Cutters are built from hi-quality stainless steel to ensure high precision cutting.
Nano SIM Card Cutter (for iPhone 5) w/ 3 Nano SIM Card Adapter