The diagram above shows how the SIM card has reduced in size over the years The first to appear was the full-size or 1FF (1st Form Factor), the size of a credit card (85.60 mm × 53.98 mm × 0.76 mm).

Also, when you order a Sim card from a provider, it'll usually send a 3-in-1 Sim, so if your phone supports a smaller size, you'll be able to break it down to the correct size for your phone. The ...