if you're tempted to buy a 2G phone on Amazon, or bring one home to use on AT&T or T-Mobile GSM networks—don't. They won't work, even if the carriers say they will. Here's why.

This applies to those who are switching carriers and are bringing a phone with them, or are buying used to use on a US carrier. If you're buying it for overseas use, just as in the US, with any recent ...

The Nexus 4 is a pentaband GSM phone, so you can use it on any GSM network. Two such networks exist in the US, but you have more than two options. Let’s go over what you need to know.

For U.S. cell phone customers, AT&T and T–Mobile are GSM carriers, while Verizon, Sprint, and US Cellular are CDMA, taking into account updates in carrier policies and plans to close off networks.

CDMA vs GSM is pretty much dead and over with. Any modern phone will fall back to support both if LTE/5G aren't available. Carrier specific frequency support is more a function of time than ...

My father is going on vacation in USA, Washington state to be more precise. He plans to bring his normal GSM phone (I think it supports GSM 800/900/1800, might be, 800/1800/1900, think it's the ...