Sprint locks iPhone 4S for international roaming
18.05.12
Sprint confirmed that, starting Friday, all new iPhone 4S models sold for use on its network will initially be carrier-locked to Sprint's designated overseas partners when using the phone outside the United States. After a few months, however, customers in good standing can request an unlock so that they can use cheaper prepaid Micro-SIM cards overseas, Sprint says.
[ InfoWorld's Galen Gruman details the iPhone 4S's "worldphone trap." | iPhone, BlackBerry, or Android? Whatever handheld you use or manage, turn to InfoWorld for the latest developments. Subscribe to InfoWorld's Mobilize newsletter today. ]
The iPhone 4S's status as a "worldphone" gives it some unique properties compared to past iPhones, at least when operating on the Sprint and Verizon networks. Those networks use the CDMA standard, rather than the rival GSM standard used throughout the world (and by U.S. carriers AT&T and T-Mobile).
Because the iPhone 4S supports both GSM and CDMA, Sprint and Verizon customers can to travel to countries without CDMA networks (which is to say, most countries) and still get a signal by using GSM instead. (By contrast, AT&T customers traveling to countries with CDMA networks cannot use such networks.) iPhone 4S models sold on those carriers come with a Micro-SIM card (the hardware that allows a phone to identify itself to a GSM network) that's tied back to their U.S. account.
Source: InfoWorld