Phone Number Validator

Phone number validation prevents wasted outreach, reduces SMS and voice delivery failures, and improves CRM quality. FoneSwift's Phone Number Validator checks numbers against international numbering plans, detects country and carrier, identifies line type (mobile, landline, VoIP), and converts between national, international, and E.164 formats.

This free tool is designed for marketers, sales teams, and developers who need fast, accurate validation before sending campaigns or importing contacts. Instead of manual formatting or brittle regex checks, our validator uses industry-standard libraries and carrier data to flag incorrect country codes, wrong digit counts, and formatting issues, and it suggests the corrected E.164 form you should store in your database.

For real-time activity status (whether a number is currently registered on a network) we offer HLR lookup and bulk validation on our enterprise plans. Privacy-first by design: single-number checks run client-side or through secure non-logging API calls and we do not store numbers entered in this tool.

Want to validate thousands at once? Check our bulk validator and API docs for automated workflows, CSV import, and integration examples. For developers, we provide sample payloads and code snippets for common languages so you can validate before you save leads to your CRM. Read our linked guides below to learn best practices for storing numbers, preventing duplicates, and improving campaign deliverability.