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The procedure for porting a SIM card from a pay-as-you-go phone to an iPhone 4 is well documented (example 1, example 2, config tool for iOS 5). This is a nice option for people mostly on WiFi who use a small number of minutes (or VoIP), because with AT&T GoPhone plans, you can keep network costs down toward $100/year.

Is there a similar procedure for porting to a high-end Android phone? For example, can you buy a $3 GoPhone from Best Buy, buy an unlocked or AT&T Samsung Galaxy S II off eBay, move the SIM card into the Galaxy, and expect it to work? Other than ensuring the GoPhone plan has a data bundle feature, what other configuration is required?

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If you have an unlocked phone, I don't think there should be any problem. The SIM card for GoPhone is apparently just a regular prepaid SIM card and is not tied to the phone it is sold with. If the phone doesn't recognize the APN for 3G, just go to Settings > Wireless and Networks > Mobile Networks > Access point Names and enter the appropriate access point settings manually.

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If the phone is locked to AT&T, would that work, too? – Edward Brey Feb 17 '12 at 16:41
@EdwardBrey: A SIM locked phone is locked to its original SIM card. – Lie Ryan Feb 17 '12 at 18:36

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