If you have an AT&T cell phone and it's paid for, you can unlock it (for free) at the AT&T Device Unlock Portal. The advantage of unlocking your cell phone is this: if you travel abroad, you can buy a prepaid SIM card in the country you travel to, and swap it for your usual AT&T SIM card. This will give you cheap voice and data access in the foreign country, compared to AT&T's foreign roving plans. When you return to the US, you can switch the SIM card back.
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