It's perhaps the most frustrating part of cell phone ownership: a phone isn't automatically compatible with any network thanks to those pesky carrier locks. If you a bit more freedom from an iPhone 4s, you need to find an unlocked 4s. There's a few reasons you might want to do this: perhaps you're traveling abroad and rather than pay international roaming charges you'd rather just pop in a SIM card from a local GSM carrier. Or maybe it's a matter of your choice of carrier. There's a few pitfalls to beware of when you buy an unlocked iPhone. Cell carriers use either GSM or CDMA radio technology, and even though the 4s technically contains the hardware for both, you can't bring an unlocked iPhone 4S from a CDMA network over to a GSM carrier in the U.S., or vice versa. There are other limitations, too, so you'll want to look closely at the unlocked 4s you buy. eBay sellers have a great selection of new, used, and refurbished devices, including factory unlocked iPhone 4s models, so you can cut back on some of the hassle, at least.
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