It looks like those with micro SIMs, or regular SIMs for that matter, aren't going to be able to whip out a pair of scissors and just cut the plastic off to turn them into nano SIMs. You'd have to shave 15 per cent off the back too.
According to the creator of the nano SIM, unlike the last jump from the mini SIM to the micro SIM, the DIY method just isn't likely to work:
"The thickness of the Nano-SIM is reduced by about 15 per cent – so we think that a reduction only in size is not working.
"Backward compatibility with older device models is ensured by an adapter solution that allows the Nano-SIM to be integrated into all established mobile devices for universal use.”
So, you could try sanding some plastic off the back with a belt sander or one of those sanding mice, but you're more than likely to wreck your SIM in the process. Probably just best to order that nano SIM from your network of choice and go through the pain of swapping them over. I suspect someone will try,though, and probably sand their hand off or something in the process. [OnlyGizmos]