If you try to insert a SIM card from a U.S. GSM carrier into an iPhone that was purchased from AT&T, Sprint, or Verizon, this or a similar message will be displayed and the use of the SIM is ...

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.

Mini BlackBerry With EDGE Coming to GSM Carriers. Article Comments 11 . May 3, 2006, 4:13 PM by (staff) The FCC yesterday approved two new GSM BlackBerrys. The existing 7130e will soon be joined ...

News Analysis: T-Mobile may be the fourth-largest national carrier, but there are other GSM carriers out there including national carriers that offer GSM-capable phones.

This means every iPhone 5S sold around the world can at least roam onto a GSM carrier's voice, text messaging and 3G data network. Things start to differ when it comes to LTE and CDMA.

Don Reisinger took a look at what's going on with the iPhone lately and believes it will be open to all carriers this year. But with a five-year exclusivity agreement breathing down his neck, will ...

Windows Phone 7 devices coming this fall will initially work with GSM carriers such as AT&T and T-Mobile, but will not include carriers of CDMA technology, which include Verizon Wireless and ...

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 ...

As Global System for Mobile Communications (GSM) networks are rolled out across the U.S., the demand will grow for related receivers and measurement systems. Luckily, some companies are already ...