Free Phone Number Validator

It runs four checks in under 1 second: (1) E.164 format normalization — converts any phone format to canonical international format, (2) country code validation against the ITU-T E.164 standard, (3) number-type detection (mobile, landline, VoIP, toll-free), and (4) regional format compliance. No call is placed; the tool only validates against published numbering plans.

No — the free tool validates format and number-type only. To confirm whether a phone is actually in service (HLR check against the live mobile network), use Cleanlist's full phone validator. HLR lookups confirm the SIM is active, catching the 23-31% of B2B phone numbers that pass format checks but are no longer reachable.

Phone validation checks the number is properly formatted and follows numbering rules (this free tool). Phone verification confirms the number is actually in service via SMS, voice, or HLR check (paid tier). Validation catches 70-80% of bad numbers; full verification catches 95-99%.

This free tool validates one number at a time (25/day). For bulk validation (100 to 1M+ numbers), upload a CSV to a free Cleanlist account — 30 credits to start, then $0.005-0.01 per number at scale. Bulk includes E.164 normalization, carrier lookup, line-type detection, and HLR confirmation.

Yes — supports all 200+ countries with valid E.164 country codes. Format validation works for US, Canada, UK, EU, Australian, and other international numbers. Carrier lookup and HLR (paid tier) coverage is strongest in North America and Western Europe.

Three common causes: (1) wrong country code (+1 prefixed to a UK number, etc.), (2) extra or missing digits, or (3) entirely fake numbers. Bought B2B phone lists frequently contain fakes — this is why bulk validation before any cold-call campaign is essential.

Twilio Lookup is a paid API ($0.005-0.04/lookup) for developers validating user-input phone numbers in apps. This tool is free, browser-based, and designed for sales/marketing pre-send list cleaning. For developer use, Twilio is solid; for B2B prospecting list cleaning, Cleanlist's bulk validator is purpose-built.

Yes. Format validation only references published numbering plans; no calls are placed and no personal data is queried. Phone numbers you call after validation must still comply with TCPA (US), CASL (Canada), GDPR (EU), and other regional telecom regulations.