It's been widely reported that the Verizon iPhone 5 ships with an unlocked SIM slot, which means you can insert any 3G nano SIM into its tray and you can use it with any carrier. The AT&T model isn't as forgiving, as all AT&T iPhone 5 (see out iPhone 5 review) models ship locked to that specific carrier. However, there are a few ways of unlocking the AT&T model for use with other carriers, like T-Mobile.
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