Phone validation · Phone carriers
Carrier guide
VoIP Phone Carrier List
Published by Trueguard. Facts about these carriers read 14 November 2026.
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Four carriers, side by side
Numbers in the blocks each carrier holds, and each carrier's share of the disposable numbers Trueguard saw.
| Carrier | Numbers in blocks held | Share of US numbers | Area codes | Trueguard line type | Share of disposable numbers |
|---|---|---|---|---|---|
| Onvoy | 219,574,000 | 11.7% | 364 | Non-fixed VoIP | 36.4% |
| Bandwidth | 79,220,000 | 4.2% | 358 | Non-fixed VoIP | 26.5% |
| Telnyx | 13,067,000 | 0.70% | 338 | Non-fixed VoIP | 18.2% |
| Twilio | 342,000 | 0.018% | 188 | Non-fixed VoIP | 3 seen, too few to share |
Trueguard data, 14 November 2026: disposable numbers in US blocks, grouped by the carrier that holds the number block. Disposable here means a number listed on a public receive-SMS site that Trueguard monitors, in the last 180 days. Base: 11,314 disposable numbers in US blocks. Block sizes from NANPA data.
Get your free API keyWhat these names mean
Block holder and current carrier
NANPA assigns number blocks to a company, the block holder. Trueguard returns it as line.originalCarrier. For US numbers, porting data shows the carrier serving a number now as line.currentCarrier. When a number is not ported, both read the same.
CLEC
Competitive local exchange carrier. Bandwidth defines CLECs as "local voice service carriers that are authorized to interconnect their local network with the Public Switched Telephone Network (PSTN)" (Bandwidth glossary, read 14 November 2026). Bandwidth glossary
CPaaS
Communications platform as a service. Serves numbers from a communications platform such as Twilio. Trueguard returns it as line.carrierType cpaasVirtual.
OCN
Operating company number, the code NANPA data lists for a company that holds number blocks. Twilio's is 506J and Telnyx's is 073H. Onvoy and Bandwidth hold 51 and 49.
Who owns a number
Trueguard shows the carrier and line type, not the owner. The platform that holds the number keeps the account details, and Trueguard does not do reverse phone lookup or caller names.
If a call or text bothers you, block the number on your phone, report the message to your own mobile carrier, and report abuse to the platform that holds the number.
Questions about VoIP carriers.
Anything missing? Contact support or read the documentation.
What do these carrier names mean on a lookup?
They name the company that holds the number block. Check a number with Trueguard: line.originalCarrier shows the block holder and line.carrierType shows cpaasVirtual for these four. 5 checks a day are free here, and 100 a month with a free API key.
What does CLEC mean?
Competitive local exchange carrier. Bandwidth defines CLECs as "local voice service carriers that are authorized to interconnect their local network with the Public Switched Telephone Network (PSTN)" (Bandwidth glossary, read 14 November 2026).
Why does my carrier show a company I never heard of?
Apps and businesses get numbers from a carrier or a provider in between, and the lookup names the block holder. The app you use is not named.
Is a VoIP number fake?
No. A VoIP number is valid and assigned to a carrier. Trueguard returns VoIP as a line type, and it never sets risk.status to risky on VoIP alone.
Why does the carrier change after porting?
For US numbers, line.originalCarrier keeps the block holder and line.currentCarrier shows the carrier the number was ported to. Porting data covers US numbers only.
Why are Google Voice and TextNow not listed?
Trueguard shows the carrier that holds the number block, not the app. An app's numbers sit in blocks that a carrier holds.
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