One of tidbits of information about the iPhone that slid under the radar was that it would be using a nano-sim on AT&T. Both the iPhone 4 and 4S used micro-SIMs. However, we didn’t know how small nano-SIMs were until today. The nano-SIM is about 40% smaller than the micro-SIM and is just 76mm big.
However, cutting down a micro-SIM to a nano-SIM will not be as easy as the SIM to micro-SIM process, as some sanding is required to get it to the correct thickness. CNET has full instructions.
T-Mobile also announced this week that it will offer nano-SIMs on September 21st, hoping to sway some unlocked iPhone users to its network.