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It depends on your location and your network For example, in the US, AT&T have a deal with Apple for a 2 year contract.

Now, you can always jailbreak your iPhone and then put in the other Sim card. You will retain your number. But I can't really say if your network will trace it or not.

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12y ago
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15y ago

Yes, you can use a AT&T SIM card from another device on the iPhone 3G, if you do not want to switch phone numbers. But make sure you change your Iphone data plan from the new sim card to the old one by calling AT&T, before going on Safari, YouTube, or any othere data app's with it.

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14y ago

no

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Q: If you buy an iphone 3g can you just stick your ATT SIM card from your previous cell phone in it?
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