well you could cut down a "regular " ( i think the regular was "mini" as the original was a credit card sized thing) SIM into a micro sim without great difficul

well you could cut down a "regular " ( i think the regular was "mini" as the original was a credit card sized thing) SIM into a micro sim without great difficulty so it should be pretty easy to do the same for a micro sim an get it to a nano sim. However the painful part of all of this is needing a sim or micro sim adapter to put it into a non nano sim phone - kind of the same situation with SD, mini SD and micro SD cards