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If you ordered an iPhone 4S or if you’re planning on getting one and you travel a lot overseas, you may want to think about going with either Sprint or Verizon, since those are the only two iPhone carriers in the US that will unlock the iPhone 4S SIM card for international travel.

It all comes down to the micro-SIM slot and what each carrier is going to do with it. AT&T locks the micro-SIM slot so you can only use the phone on its network. When you travel overseas, you must purchase AT&T’s costly international roaming plans.

Sprint and Verizon, though, use CDMA for their domestic service and the micro-SIM slot for international service only. These two carriers can unlock the micro-SIM card slot and not worry about people jumping ship to another carrier.

Between Sprint and Verizon, Sprint offers the better deal on the iPhone 4S. It’s selling the handset with an unlimited data plan and an unlocked micro-SIM slot. Verizon does not have an unlimited data plan and will unlock your handset, but only after you have been a customer in good standing for 60 days. This international unlock is available for all Verizon’s world phones, but this is the first time it applies to the iPhone.

Via