Upon having my iPhone 4 three days ago I had to result to DIY to use the phone. I know you can buy sim cutter but I don't want to because I will never use it again and it will just be a waste of money.
So here we go... Now first we have to know the measurements on the micro sim. Not all sim card are the same, the metal part comes in different sizes depending on its capability or the time you've been having it.
micro sim measurements: width = 12mm length = 15mm
Let's start the fun.
These are the tools I used to make my life easier, the most important is the Blade 11 surgical knife or the equivalent. I never use scissors cause they can ruin your sim if you are not careful in cutting and they don't give precision cut.