Locked (on contract) iPhone 4s, can I put my sim into a Nexus 4?

I have an iPhone 4S and it's on contract with AT&T. It has a mini sim card just like a Nexus 4 uses, so can I pop out the sim card, put it into a Nexus 4, and use it to test the Nexus 4 (with data and voice and all)?

Yes.

You can put a SIM card in any phone, so long as the phone is released under the same network as the SIM card.

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