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OF COURSE , all phones HAVE to have a sim card to work because it must store your number and any information you put on the phone. i think it may work without one , BUT i dont think you can save contacts or even get calls.

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13y ago
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13y ago

the sim card just holds network information not phone information so yes you can transfer your sim card without any problems i had a sim card from about 3 years ago and i just bought a iPhone 3GS and it works fine in it

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13y ago

Yes but you will not get the benefit of the 3G speed. Any AT&T SIM can be used in any AT&T device, except for the micro-SIM in the iPhone 4.

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Q: Does an iPhone 3GS sim card work on iPhone 3G?
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