Nano-SIM Cards Stockpiled In Advance of iPhone 5 Launch http://www.cultofmac.com/179199/nano-sim-cards-stockpiled-in-advance-of-iphone-5-launch-report/ Sim size has not really changed in size since it came onto the market, time for a change ? It was not so long ago apple were making noises about negating a SIM card altogether, (like american wcdma networks). GSM how ever stipulates the need for SIM card use.
Does this show to real problems this sort of tech has, its on show, there are many situations you would not get your latest and greatest smart phone out of your pocket.