This tool standardizes input to E.164 format (e.g., +14155552671), detects line type (mobile/landline/VoIP when available), and catches obvious errors before you send.
What It Checks
Country/region parsing and correct length for that numbering plan.
Valid prefixes and possible line type metadata (where supported).
Duplicates and malformed entries in bulk uploads.
Use it before carrier lookup or Email→SMS to improve delivery rates.