[youtube]http://youtu.be/6wYuqgbShyo[/youtube]
Before you watch the clip, I will tell you that the process is complicated and without iron patience, plus a utensil for the exact measurement of the card, you will have to struggle a bit more to get what you want. Practically in a clip it is shown to us how to cut almost all the plastic around the chip of a micro SIM, but that's not all because the current cards are too thick to be inserted iPhone 5, so you have to reduce the thickness with whatever you think is appropriate. A nano sim card has: 12.3mm width, 8.8mm height and 0.67mm thickness.
These figures are indicative because if you cut the entire plastic around the chip, constantly checking if that card fits in the SIM drawer, you will succeed in what you propose. The bigger problem is removing a few tenths of a millimeter from the thickness, but if you are skilled, then you shouldn't have too many problems. Official dimensions of the nano SIM you have them here, but I recommend that you do this procedure only after you purchase an iPhone 5 with a nano SIM from an operator that sells such a thing.
