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

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.

Because each GSM radio channel has a frequency bandwidth of 200 kHz, this divides into 125 radio channel carriers. In some systems, the entire frequency band may not be available, and in other systems ...

There are plenty of ways to do just that, from prepaid carriers such as Mint Mobile to cable companies' mobile endeavors, like Comcast's Xfinity Mobile and Charter's Spectrum Mobile. All of them ...

Other key features include quad-band GSM, Bluetooth, VGA camera, changeable metal casing, and speakerphone. This phone is not currently available from any major U.S. carrier. It is compatible with ...

This high-end GSM phone puts the extensive feature list ... This phone is not currently available from any major U.S. carrier. It is compatible with some U.S. networks, and may be available ...

The first touchscreen BlackBerry phone. Introduced in 2008, the Storm was a dual-band phone that supported both CDMA and GSM carriers. The original Storm touchscreen featured SurePress technology ...

As consumers have over time migrated to the newer and faster mobile network standards then, the usage of the older versions has reduced to the point at which carriers are starting to turn them off.

That beats out just about every other device in our best phone battery life list ... best support your carrier's network. Always opt for the international versions of GSM unlocked handsets ...

It’s a platform-neutral standard adopted by the GSM Association to do messaging over your internet data connection rather than strictly your carrier network. It provides many of the same ...

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.

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.