Since the latest iPhone 5 will be using nano-SIM, it could now be the problem of interested users to change their micro-SIM to nano-SIM before they can actually enjoy the ride with new iPhone 5. But someone might think of cutting the micro-SIM into nano-SIM so to save the conversion fee from phone shop. It seem like this idea have been denied by SIM inventor, Giesecke Devrient. Giesecke Devrient, also the manufacturer of nano-SIM, had confirmed that micro-SIM just cannot be cut into nano-SIM. Even with the same dimension, the nano-SIM is just 15% slimmer than the normal micro-SIM which cause the mismatching of nano-SIM slot within iPhone 5.