Lead phone number validator and duplicate finder

Cash-on-delivery stores pay for every call an agent makes, so a bad number costs real money twice: once in ad spend and once in the call. Paste a column of numbers (one per line, or CSV) and see what you actually have.

Customer phone numbers never leave this tab — the whole check runs in your browser.

What counts as invalid

Too short or too long for its country, non-digits that are not formatting, obviously fake runs like 0000000000 or 1111111111, and repeats of a number you already have. Relayo's lead quality firewall applies the same checks automatically, before a junk lead ever reaches your confirmation team.