The Micro SIM Card size is small compared to the original SIM card but not quite as small as the Nano SIM card. The Micro SIM is also used in the iPhone 4s.

Micro SIM Card - Micro SIM Cards were introduced with the iPhone 4 in 2010.

The original iPhone along with the older iPhone 3G and 3GS all use the original SIM Card, according to Apple.

However, if you want to transfer your data to a new phone, you can take out a small portion of the SIM card to insert into another iPhone.

Standard SIM Card - The original SIM Card size is similar to any card in your wallet.

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