That's still a valid option today, but make sure the phone supports your carrier's bands for 3G and LTE before you buy. Unlocked phones tend to cost even more than phones purchased outright from ...

GSM uses Subscriber Identity Module (SIM) to keep user’s subscription information and phone book. GSM works by using data in SIM card to send and receive texts, make and receive calls, or access ...

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.

Carriers around the world are converging on 2017 as the year to turn off their GSM networks, with three operators in Singapore announcing Monday their plans to reuse their GSM spectrum for other ...

Model A1633 and A1634 (iPhone 6s and 6s Plus), which it lists for AT&T and 31 other U.S. carriers—other all other GSM carriers except T-Mobile. Model A1688 and A1687 (ditto) for T-Mobile, Sprint ...

Computer scientists have devised a low-cost way to surreptitiously tease out key location details of people carrying cellphones that are connected to older carrier networks. The attack, described ...

The wireless developer says it's set to launch the first trial of equipment that lets cell phone carriers committed to GSM networks switch over to Qualcomm's rival CDMA-based technology.