Does the iPhone 4 fit an ordinary size SIM?

Or do iPhones only take microsims or something like that?

Yes it does

Microsim is what you need for an iPhone 4

All iPhones up to and including the 3gs take an ordinary sim. The iPhone 4 and 4s take a microsim, and the iPhone 5 takes a nano-sim. So for the iPhone 4, you would need a micro-sim. If you have a regular sim, and want to use the number in an iPhone 4s, ask the network you want to use it with if they can swap your number and the allowances to a micro-sim for you. They will be happy to do so, although some networks charge a fee for this.

The iPhone 4 uses microSIMs.

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