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.

The company offered service under the Cellular One brand in most regions. Although originally a TDMA carrier in most areas, the company migrated to GSM technology.

With the Luddite revival in full-swing, here are five dumbphones that can still run WhatsApp — and a few others.

Ultimately it's a matter of what you want from a mobile carrier. Do you have strong opinions for or against GSM? Is there a particular brand or model of smartphone you want, and does T-Mobile offer it ...

This quad unlocked GSM import phone will work with any GSM carrier, and it has triband 3G UMTS and HSDPA that likewise will work anywhere in the world 3G is available (including the US on AT&T). The ...

This device combines a Windows Mobile 5 PDA with a quad-band GSM phone. Key features include ... and a miniSD memory card slot. Carrier-dependent features include a 1.3 megapixel camera, Java ...

The GSM Association, which develops the RCS standard, said online it's working to enable end-to-end encryption between these ...

But the specific process depends on the kind of cell phone carrier ... use in the US today. AT&T and T-Mobile are the most popular examples of a kind of network technology called GSM.

What is RCS? Rich Communication Services messaging is the next-generation SMS with group chats, video, audio, and images. Here's what you need to know.

Third-party app stores will be visible within the Play Store, and developers can bypass Google’s 30% app tax in the US. Last ...

The GSM Association, which develops the RCS standard ... Tap General. 3. Tap About. 4. Tap Carrier. When you tap Carrier, it will change to IMS Status and show messaging support details to ...