T-Mobile US, Inc.—not to be confused with its wholly-owned subsidiary T-Mobile USA, Inc.—is a telecommunications provider operating a US wireless network. Its largest shareholder is Deutsche Telekom AG.
Sprint Communications, LLC offers wireless telecom services.
Quality Speaks, LLC offers telecommunications services, including voice over internet protocol (VoIP), broadband phone services to single-line residential customers, and other services.
CenturyTel Broadband Services, LLC, which does business as CenturyLink Broadband, provides broadband, voice, data communications, and other related services.
RCN Telecom Services, LLC provide Internet services and cable television for residential areas.
Nokia of America Corporation provides technology, including wireline and wireless communications equipment. It is owned by Finnish company HMD Global.
AT&T Mobility, LLC is a subsidiary of AT&T, Inc. It is also known as AT&T Wireless and provides wireless service in the US, although not in Puerto Rico or the US Virgin Islands.
GTT Communications, Inc., formerly called Global Telecom and Technology, is a multinational company that offers telecommunications and Internet service.
Cellco Partnership, Inc., commonly known as Verizon Wireless, is the second-largest wireless carrier in the US, offering a 4G LTE network. It is a division of Verizon Communications.
Zoom Telephonics, Inc. designs, makes, and supports communications equipment, primarily for Internet access and wifi and primarily modems, through retailers such as Amazon, Best Buy, Target, and Walmart.