While the best unlocked phones almost certainly support GSM carriers like AT&T and T-Mobile, it’s best to look for devices that work with all the major U.S. providers, including Verizon.

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Good news! That means your cell phone will likely work in most foreign countries. These three carriers use the GSM network, which is standard in Europe and widely used in Africa, most parts of Asia, ...

Telia Estonia has denied plans it will retire its 2G network next year, insisting that the service will remain until at least ...

It's also important to remember that not all carriers support all smartphones -- there ... One final caveat is that T-Mobile relies on a GSM (Global System for Mobiles) network rather than CDMA (Code ...

A GSM network uses two separate networks ... to be able to offer roaming services), providers use international carriers (France Telecom, Belgacom, Teleglobe, Swisscom, British Telecom, and so on), ...

Our guide to the best Verizon phones is perfect if you're currently weighing up your options or simply want to know what's available right now at the nation's leading carrier. Whether you're an ...

A feature-packed new slide-style GSM phone with a 1.3 megapixel ... currently available from any major U.S. carrier. It is compatible with some U.S. networks, and may be available from third ...

technology to enable seamless handover between GSM and Wi-Fi networks. Orange will be one of the first carriers to offer the handset, according to Nokia. UMA is a specification developed by ...

This 3G smartphone for overseas markets also has quad-band GSM and EDGE for use ... available from any major U.S. carrier. It is compatible with some U.S. networks, and may be available from ...

So-called mobile virtual network operators (MVNOs) like Cricket and Consumer Cellular use GSM as well, since, as "virtual" operators, they piggyback on a larger carrier - in this case, AT&T's network.