These 35 carrier names show up on US phone lookups, and each page explains one.
A phone lookup names the company that holds a number on the phone network, and that is often a legal or wholesale name you have never seen on a bill. Each page below says what the company is, why a lookup shows it, and where it holds numbers, from NANPA's file of the 198,436 assigned US prefixes.
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Of these names, New Cingular Wireless PCS, LLC holds the most US prefixes, 18,705.
- New Cingular Wireless PCS, LLC18,705
- Onvoy, LLC13,033
- Level 3 Communications, LLC10,346
- BellSouth7,262
- T-Mobile USA, Inc.7,037
- Southwestern Bell6,013
- Qwest Corporation5,604
- PAETEC iTel, LLC5,552
- Pacific Bell4,958
- Omnipoint Communications4,885
- Bandwidth.com CLEC, LLC4,804
- MetroPCS4,383
Source: NANPA central office code assignments, October 1, 2026.
These names belong to wholesale and internet phone carriers.
- Onvoy, LLCSupplies numbers to VoIP and app-based phone services, 13,033 prefixes
- Bandwidth.com CLEC, LLCSupplies numbers to VoIP and app-based phone services, 4,804 prefixes
- Fractel, LLCSupplies numbers to VoIP and app-based phone services, 2,858 prefixes
- Onvoy Spectrum, LLCSupplies numbers to VoIP and app-based phone services, 1,770 prefixes
- Peerless NetworkWholesale phone carrier, 1,265 prefixes
- NUSO, LLCCloud phone and wholesale number carrier, 739 prefixes
- IP Horizon, LLCNumber holder with no public description, 616 prefixes
- HD Carrier, LLCNumber holder with no public description, 329 prefixes
- SkyetelWholesale phone carrier, 222 prefixes
- YMax Communications Corp.Internet phone service, 90 prefixes
- Neutral TandemWholesale phone carrier, 16 prefixes
These names belong to mobile networks.
- New Cingular Wireless PCS, LLCMobile network, 18,705 prefixes
- T-Mobile USA, Inc.Mobile network, 7,037 prefixes
- Omnipoint CommunicationsMobile network, 4,885 prefixes
- MetroPCST-Mobile's prepaid brand, 4,383 prefixes
- Aerial Communications, Inc.Mobile network, 1,792 prefixes
- PowertelMobile network, 1,331 prefixes
- United States CellularMobile network, 1,160 prefixes
- SunComMobile network, 852 prefixes
- VoiceStreamMobile network, 155 prefixes
These names belong to the old Bell local phone companies.
- BellSouthAT&T's landline company, 7,262 prefixes
- Southwestern BellAT&T's landline company, 6,013 prefixes
- Qwest CorporationLumen's landline company, 5,604 prefixes
- Pacific BellAT&T's landline company, 4,958 prefixes
- Illinois BellAT&T's landline company, 1,909 prefixes
- Michigan BellAT&T's landline company, 1,410 prefixes
- Ohio BellAT&T's landline company, 1,173 prefixes
These names belong to business phone networks.
- Level 3 Communications, LLCLumen's business and wholesale network, 10,346 prefixes
- PAETEC iTel, LLCWindstream's business phone network, 5,552 prefixes
- Teleport Communications America, LLCAT&T's business phone network, 4,083 prefixes
- TPx CommunicationsBusiness phone and internet company, 807 prefixes
- AllstreamBusiness phone and internet company, 450 prefixes
- LightpathBusiness fiber and phone network, 269 prefixes
These names belong to paging networks.
A prefix is the three digits after the area code. A pooled prefix shares blocks of 1,000 numbers with other carriers and any number can have been ported, so these counts show who holds prefixes, not who serves one number. To check one number, use the free carrier lookup, and to see every carrier in one area code, start from the area code lookup.