If you are upgrading your phone for an iPhone 5 this Friday, be prepared to get a new Nano-SIM card that will fit the iPhone 5 or you can take the chance of cutting your old SIM to the appropriate size. The cutting guide below will help you get your standard-SIM or micro-SIM down to the size of a nano-SIM. The process is pretty straight forward and painless but be careful because you can ruin the SIM card if you mess up.

The guide below was created by Christian von der Ropp and can be downloaded here. After you cut down your SIM you won’t be able to use it on phones with larger SIM card slots. If you are a person who switches phones constantly,  you can get a SIM adapter for cheap on Amazon.