Swapping out your SIM card on your iPhone 4S when you travel abroad is a good way to avoid expensive roaming charges. But whether you can do it, and on which carrier it's allowed, can be confusing.
In this edition of Ask Maggie I answer what should be a simple and straight-forward question about whether a Verizon Wireless iPhone 4S can be used overseas on a foreign carrier's network. I also offer some advice to another reader looking for voice-only service with a smartphone on T-Mobile's prepaid plans.
Confusion around unlocked iPhones
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