Phone verification Live

Phone verification is line-type intelligence: before you text or call a number, Verify tells you what kind of number it is and which carrier serves it. That single fact — mobile or not — decides whether a text can even arrive.

How it works#

Verify classifies each phone number as MOBILE, LANDLINE, VOIP, or UNKNOWN, and records the carrier alongside the classification. For what each type means in practice, see Phone number types.

Results are cached for 30 days. Verifying a number again inside that window reuses the cached result, so you are not paying to re-check numbers you checked recently. The cost of a verification run is shown in-app before you confirm, and credits are only charged on success.

Verification is not just informational — batch eligibility uses it. The SMS eligibility pipeline considers line type when deciding which contacts a batch can text, and batches containing numbers with unverified line types ask you to confirm with a "Send to unverified numbers?" dialog before sending.

When to use it#

Verify after new numbers arrive — from a skip trace or an import — and before any SMS batch. Sending to unverified numbers risks paying for messages that can never be delivered. The verify phone numbers guide covers the flow in the app.

Limitations#

• Some numbers come back UNKNOWN — the line type could not be determined. Treat these with the same caution as unverified numbers.
• A classification reflects the number at verification time. Numbers change hands and services change, which is why results expire from the cache after 30 days.
• Line type says nothing about consent. A verified mobile number still requires verified consent for batch and campaign SMS — see Consent records.