The regular sims an be cut down to fit the iPhone 4/4s mico sim. The electronics are the same, the regular ones just have more cardboard. I have a punch which is only about $5 and makes it painless, but if one is not available I have cut the regular ones with just a pair of scissors. It is fairly easy just use your existing mico sim from your iphone to trace the pattern on the regular sim, and then cut it.