Free tools / VoIP Number Check

VoIP number check

VoIP numbers are free or nearly free to create, which makes them the number of choice for fake signups, promo abuse, duplicate accounts and robocalls. This check tells you whether a number is a VoIP line, a mobile on a real carrier, a landline, or toll-free, using the carrier classification for the number rather than guesswork from the prefix.

Mobile, landline, VoIP or toll-free, from carrier data. No signup. 20 free checks a minute.

The classification comes from the carrier of record. A Google Voice or Bandwidth number shows as VoIP; a T-Mobile number shows as mobile. Because we look at the current carrier, a landline that was ported to a VoIP provider shows as VoIP, which prefix databases miss.

What you get back

Line type. Mobile, landline, VoIP or toll-free. VoIP is the flag most fraud rules key on.

Carrier. The provider behind the number. Wholesale VoIP carriers (Bandwidth, Twilio, Telnyx, Onvoy) versus consumer carriers.

Validity. Whether the number is assigned at all. Made-up numbers fail here before line type even matters.

Location. Rate center city and state, useful for spotting a batch of signups all using numbers from one exchange.

How to use it

  1. Paste the number from the signup form, the CRM record or your caller ID.
  2. Press Check line type.
  3. Decide what to do with VoIP. Most teams do not block outright; they route VoIP signups to extra verification or exclude them from SMS campaigns.

Who uses this

Product and growth teams. Free trials, referral bonuses and coupons get farmed with VoIP numbers. A line type check at signup stops most of it.

Call centers. Lists with a high VoIP share usually came from a bad vendor. Checking a sample before paying tells you.

Marketplaces and dating apps. Requiring a mobile line, not VoIP, is the cheapest identity friction that actually works.

Same check, in your code

One API key, one credit pool, 1,000 free lookups to start. Phone, email, IP and DNS checks from a single endpoint, and you only pay for lookups that return an answer.

Start free Read the docs

Questions

Should I block all VoIP numbers?

Usually not. Many small businesses and remote workers run on VoIP. The better pattern is to treat VoIP as a risk signal and add a step (email confirmation, card on file, manual review) rather than a hard block.

Is Google Voice VoIP?

Yes. Google Voice numbers are classified as VoIP by their carrier. So are numbers from TextNow, Burner and similar apps.

Can a number change type?

Yes. Numbers get ported between carriers, and a landline can move to a VoIP provider. We report the current classification.

Can a VoIP number receive SMS?

Some can, some cannot. Many VoIP providers do not accept application-to-person SMS, which is why the delivery rate to VoIP numbers is poor.

How is this different from the phone number lookup?

Same engine, different framing. This page is for the line type question; the full lookup page explains every field.

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