Here is a guide based on which you can turn a SIM card into a nano SIM

  I don't know how many of you have held a nano SIM card in your hand, but I will tell you from now on that they are very small, and that requires cutting the micro-SIM cards to be able to use the Romanian operator's subscription with a iPhone 5. If you don't have a nano SIM available to cut your card based on it, then you need a full-scale guide that you can print and based on which you can cut your card. A user did GUIDE below, it shows the actual size of the cards you can cut, but it also marks exactly the months you have to follow for cutting.

  If you have courage, a printer and a surgeon's hand, then you can start cutting the card now.