Are the SIM cards in iPhones different?

Size. Different models of iPhone use different sized SIM cards. The 4 and 4S use a smaller micro-SIM card while the 5 uses a smaller and thinner nano-SIM card. It is possible to cut down a full-sized SIM card to use in an iPhone 4 or 4S by removing part of the SIM card that doesn't contain any data.

Updated: 18th November 2019

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