Phone carriers · Twilio
Carrier guide
What Is a Twilio Phone Number?
Twilio at a glance
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If a lookup names Twilio, someone rented the number on Twilio's platform. Twilio sells US local numbers for $1.15 a month, "instantly provisioned" (Twilio pricing, read 14 November 2026). Trueguard returns them as line.type voip, line.voipType nonFixed and line.carrierType cpaasVirtual.
Published by Trueguard. Facts about Twilio read 14 November 2026.
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What Trueguard returns for a number in a Twilio block
| Field | Value | Why |
|---|---|---|
line.type | voip (VoIP) | A number served over the internet. |
line.voipType | nonFixed (Non-fixed VoIP) | A number obtained online without a physical line. |
line.carrierType | cpaasVirtual (Virtual number provider (CPaaS)) | Served from a communications platform. |
line.smsCapable | true | Trueguard marks non-fixed VoIP numbers SMS capable. |
line.originalCarrier | Twilio | The holder of the number block. A number in a Twilio block reads Twilio. |
line.currentCarrier | Twilio | Twilio when the number is not ported. For a US number that was ported, the carrier it moved to. |
risk.status | safe | Safe unless the number is disposable or premium rate. |
Example: +1 415 992 9960
Example data from a real check of this number.
Valid
+1 415 992 9960
This number is valid and shows no risk signals.
- Carrier type
- Virtual number provider (CPaaS)
- Line type
- VoIP
- VoIP type
- Non-fixed VoIP
- 1
Lumen holds the range
Lumen is the original carrier, the holder of the number block that +1 415 992 9960 comes from.
- 2
The number was ported to Twilio
Twilio serves it now, so the current carrier reads Twilio and the ported flag is Yes.
- 3
Non-fixed VoIP, status safe
Trueguard returns line type VoIP, VoIP type non-fixed and risk status safe. The rule steps this signup up.
Twilio in Trueguard's data
3 numbers in Twilio-held blocks, too few to read anything into. Many numbers Twilio serves sit in other carriers' blocks or were ported in, like +1 415 992 9960, so this count says nothing about them.
| 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 keyAbout Twilio
Who Twilio is
Twilio Inc. was incorporated in Delaware in March 2008. Its principal executive offices are at 101 Spear Street, San Francisco.
Source: Twilio 10-K for FY2025 (SEC), read 14 November 2026.
US local numbers cost $1.15 a month. Twilio describes them as "clean local phone numbers instantly provisioned via Twilio console or number provisioning API".
Source: Twilio voice pricing page, US, current as of October 2026, read 14 November 2026.
Twilio calls itself "a licensed telecommunications provider". It also says it expects "to continue to rely to some extent on network service providers" for voice and messaging.
Source: Twilio 10-K for FY2025 (SEC), read 14 November 2026.
Twilio requires registration for US texting from long code numbers: "Registration is required for all customers sending messaging traffic to the United States using long code numbers."
Source: Twilio Help, A2P 10DLC registration, read 14 November 2026.
Why a Twilio number calls or texts you
Businesses use Twilio to send codes, reminders and updates from software, and some use it to place calls. Numbers are provisioned through a console or an API, so any account holder can rent one.
A lookup that names Twilio shows the platform. The sender's identity sits with Twilio and its customer.
Can you find out who owns it?
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.
Detect Twilio numbers at signup
Trueguard returns a number in a Twilio block as non-fixed VoIP, so the rule is to step up. A non-fixed number with receive-SMS history is blocked.
| The rule for numbers on Twilio | Action |
|---|---|
line.type mobile, risk.status safe | Allow |
line.voipType fixed | Allow. line.smsCapable is false, so verify by another channel such as email. |
line.voipType nonFixed, no disposable history | Step up |
line.voipType unknown | Step up |
Any line with risk.previouslyDisposable true | Step up |
line.voipType nonFixed and risk.isDisposable true | Block |
line.voipType nonFixed and risk.previouslyDisposable true | Block |
Any line with risk.status risky (disposable or premium rate) | Block |
risk.status invalid | Reject and ask the user to re-enter |
Check for Twilio numbers from your code
The same data comes from POST /v2/phone/validation, one number per request. 100 checks a month are free with no card. The Standard plan is $49.99 a month for 20,000 checks, then $0.0025 a check. Median response is under 500 ms.
curl -X POST https://api.trueguard.io/v2/phone/validation \
-H "X-API-KEY: $YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{"phone":"+14159929960"}'Questions about Twilio numbers.
Anything missing? Contact support or read the documentation.
Is this a Twilio number?
Check it with Trueguard. line.originalCarrier shows Twilio when Twilio holds the number block. For US numbers, line.currentCarrier shows Twilio when the number was ported to it. 5 checks a day are free here, and 100 a month with a free API key.
Why is a Twilio number calling or texting me?
Businesses use Twilio to send codes, reminders and updates from software. Numbers are provisioned through a console or API, so anyone with an account can rent one. The carrier names the platform, not the sender.
Is a Twilio number a scam?
Not by itself. Twilio is a public company and calls itself a "licensed telecommunications provider" in its FY2025 10-K (SEC, read 14 November 2026). Judge the message, and never share a code you did not request.
Can you trace a Twilio number?
Not with a carrier lookup. Trueguard returns carrier and line type, not the owner. The account details sit with the platform that holds the number, so report abuse to Twilio or the app that sent the message.
Is Twilio a real phone carrier?
Yes. It holds US number blocks under OCN 506J in NANPA data. Its FY2025 10-K says it also relies to some extent on network service providers (SEC, read 14 November 2026).
Is a Twilio number VoIP?
Yes. Trueguard returns line.type voip and line.voipType nonFixed, a number obtained online without a physical line.
Can I block Twilio numbers on my signup form?
Blocking every Twilio number also blocks real users. The Trueguard rule steps up non-fixed VoIP and blocks a non-fixed number listed on a receive-SMS site in the last 180 days. The last 30 days sets risk.isDisposable and status risky. 31 to 180 days sets risk.previouslyDisposable.
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