Inserting a SIM card into your smartphone is simple, but it can be a little confusing if you've never done it before. To help you get started, here's an explanation of the different types of SIM cards, along with step-by-step instructions on how to properly insert a SIM card into an Android or iPhone.

There are three main formats of SIM cards in use today: Nano SIM, Micro SIM, and Standard SIM (for older phones). The only difference is the size of the bezel around the chip, which allows the SIM to fit into different phone models.

The size of the SIM card you use depends on the make and model of your smartphone. Most modern smartphones have a Nano or Micro SIM, while some older phones use a Standard SIM.

For more information about phone models and SIM cards, see this list from whistleOut.