Apple began selling so-called “unlocked” iPhone 4’s this week via its U.S. online store. “Unlocked,” in this case, means that the phone isn’t partial to one carrier or another—any supported GSM wireless carrier can be the one you use. Of course, in the U.S., that doesn’t mean a whole lot: an unlocked iPhone 4 will only work over the AT&T 3G network. But it’s a significant perk when traveling abroad. While in another country, you could pop out the micro-SIM card you have and replace it with a local one. To live unlocked also means that you don’t have to sign on to a multi-year service contract, if you’re commitment averse.
If terms like “micro-SIM” and “GSM” are new to you, Apple has a refresher on the page where they’re hawking the new phones. GSM stands for “Global System for Mobile Communications,” and is the most common industry standard for wireless communications. AT&T uses GSM; the Verizon iPhone, though, roams on a different kind of network called CDMA. And a micro-SIM card is the small memory card inside your cell phone that carries information related to your wireless account. Though iPads also use micro-SIM cards, notes the Apple FAQ, you can’t interchange those with the micro-SIM card in your iPhone 4.
The specs on the phone are the same as in any iPhone 4: you’ve still got FaceTime, HD recording, a 5-megapixel camera, and so on. You can get the unlocked iPhone in a 16 GB version (for $649) or a 32 GB one (for $749). Those prices are a significant hike, it should be noted, over the AT&T and Verizon versions; with either of those carriers, the 16 GB starts at $199 and the 32 GB at $299. The unlocked versions, like the locked versions, are available in white as well as black.
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