Phone validation · VoIP number checker
Free tool
VoIP Number Checker
What you get
Get 100 free checks a monthNo credit card required.
Check if a phone number is VoIP.
Start with + and the country code. 5 free checks a day. Shows the line type and VoIP type, not who owns the number. Results never get a public URL.
Or try
Example: a VoIP number that was ported
Example data. A real result for +1 415 992 9960.
Valid
+1 415 992 9960
This number is non-fixed VoIP.
- 1
VoIP, non-fixed
Non-fixed VoIP numbers come from apps and online services and are not tied to an address.
- 2
Ported from Lumen to Twilio
Lumen holds the range. The number was ported to Twilio, a virtual number provider (CPaaS). For a ported US number, line type and carrier type describe the current operator.
- 3
SMS capable
Trueguard marks non-fixed VoIP as SMS capable, so SMS capable is Yes.
How to check if a number is VoIP
Type the number
Press Validate
Read line type and VoIP type
What the result means
A VoIP number carries calls over the internet instead of a mobile network or a phone line. It comes from a real number range and makes and takes calls like other numbers. Every field and value is in the API documentation.
| Field | What it tells you | Where | +1 415 992 9960 |
|---|---|---|---|
| Line type | Mobile, landline, VoIP, toll free and others. | Any country | VoIP |
| VoIP type | Fixed or non-fixed. Shown for VoIP numbers only. | VoIP numbers | Non-fixed VoIP |
| Carrier type | Mobile network, virtual mobile network (MVNO), virtual number provider (CPaaS) or fixed line provider. | Any country, where known | Virtual number provider (CPaaS) |
| SMS capable | Yes for mobile and non-fixed VoIP, No for landline and fixed VoIP. Empty when it is not known. | Any country | Yes |
| Original carrier | The operator that holds the number range. | Any country, where known | Lumen |
| Current carrier | The operator that serves the number now, from the US porting database. | US numbers | Twilio |
| Ported | Yes when the number left the operator that holds its range. | US numbers | Yes |
Fixed VoIP vs non-fixed VoIP
VoIP type splits VoIP numbers in two. Carrier type shows what kind of operator serves the number.
Fixed VoIP
fixedNon-fixed VoIP
nonFixedVirtual number provider (CPaaS)
cpaasVirtualWhy a number from a mobile or landline range can show as VoIP
Number ranges are assigned to one operator. When a number is ported, it moves to another operator and the range stays with the first. If that operator is a VoIP provider, the number shows as VoIP.
Holds the number range. Shown for any country where the data is known.
Serves the number now. From the US porting database, so US numbers only.
Current carrier and porting come from the US porting database. Outside the US, line type follows the number range.
Got a call from a number and want to know who it is?
The checker tells you if a number is VoIP and which operator serves it. It does not tell you who called. Trueguard does not do reverse phone lookup, and a VoIP result on its own does not mean a call was a scam.
What a VoIP check can't tell you
A VoIP check reads numbering and porting data. These questions need other data.
Who owns the number
Whether someone answers
Whether a caller is honest
Porting outside the US
What businesses use VoIP detection for
Challenge non-fixed VoIP at signup
Skip SMS to lines that cannot receive it
Spot virtual (CPaaS) numbers
Check for VoIP from your code
The same data comes from POST /v2/phone/validation, one number per request. Read line.type, line.voipType, line.carrierType and line.smsCapable. 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 VoIP number checks.
Anything missing? Contact support or read the documentation.
How can I tell if a phone number is VoIP?
You cannot tell from the digits alone. A lookup reads numbering data, and porting data for US numbers, and returns the line type. Enter the number above with + and the country code.
Can you find out who owns a VoIP number?
No. The checker returns operator data, not a person. Trueguard does not offer reverse phone lookup or caller names.
Is a VoIP number a real phone number?
Yes. VoIP numbers come from real number ranges. Valid means the number matches its country's numbering plan and belongs to a real range.
What is the difference between fixed and non-fixed VoIP?
Fixed VoIP is tied to an address. Non-fixed VoIP comes from apps and online services and is not tied to an address. Trueguard marks non-fixed VoIP as SMS capable and fixed VoIP as not. When the data does not say, VoIP type is Unknown.
Can a VoIP number receive SMS verification codes?
Trueguard marks non-fixed VoIP as SMS capable, like mobile, and fixed VoIP and landlines as not. When the VoIP type is unknown, SMS capable is left empty.
Should I block VoIP numbers at signup?
A blanket block also turns away people who use VoIP as their main number. One approach is to send non-fixed VoIP and virtual (CPaaS) numbers to a second check before you send a code.
Does the checker call or text the number?
No. There is no call, no SMS and no HLR lookup, so it cannot tell you whether someone will answer.
Why does a mobile or landline number show as VoIP?
Because it was ported to a VoIP provider. +1 415 992 9960 comes from a Lumen range and is served by Twilio now. Porting data covers US numbers only, so outside the US the line type follows the number range.
Does it work for numbers outside the US?
Line type, VoIP type, carrier type and original carrier work worldwide where the data is known. Current carrier and porting cover US numbers only. Canadian numbers do not get them.
Is the VoIP checker free, and can I check many numbers?
5 checks a day in the browser with no account. A free API key gives 100 checks a month with no card. Above that, the Standard plan is $49.99 a month for 20,000 checks, then $0.0025 a check. The page checks one number at a time. For more, use the API.
Check for VoIP from your backend.
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