T-Mobile US, Inc.

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.

Quality Speaks, LLC

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

CenturyTel Broadband Services, LLC, which does business as CenturyLink Broadband, provides broadband, voice, data communications, and other related services.

Nokia of America Corporation

Nokia of America Corporation provides technology, including wireline and wireless communications equipment. It is owned by Finnish company HMD Global.

AT&T Mobility, LLC

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.

GTT Communications, Inc., formerly called Global Telecom and Technology, is a multinational company that offers telecommunications and Internet service.

Cellco Partnership, Inc.

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.

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.