// Glossary
Line Type
Whether a phone number is mobile, landline, or VoIP, which affects how you can reach it by SMS and which consent rules apply.
Definition
Line type classifies a phone number as mobile (wireless), landline (fixed), or VoIP (internet-based). It matters for outreach because SMS only works on mobile and some VoIP numbers, and because regulations like the TCPA impose stricter consent rules on calls and texts to wireless numbers. Identifying line type before dialing or texting helps you route contacts correctly and stay compliant.