// Guide
Phone Line-Type Verification: Mobile vs. Landline
Last verified · 2026-06-24
The short answer
Phone line-type verification identifies whether a number is mobile, landline, or VoIP, and confirms whether the line is active. It matters because SMS only works on mobile, and calling dead or landline numbers wastes rep time and can raise compliance risk. Verify line type before any call or text campaign. Trackyr's phone verification returns line type and active-line status for 2 credits.
Why line type matters
Not every phone number can receive a text, and not every number is even in service. Sending SMS to a landline silently fails; dialing a disconnected number wastes a rep's time. Line-type verification tells you what you can actually do with a number before you try.
The line types
| Line type | Can SMS? | Notes |
|---|---|---|
| Mobile | Yes | Textable and callable |
| Landline | No | Call only |
| VoIP | Sometimes | Check active status |
Active-line status
Line type alone isn't enough. A mobile number that's been disconnected is useless. Active-line verification confirms the number is currently in service, so your call and SMS lists aren't padded with dead numbers.
Compliance angle
Texting the wrong line type or a reassigned number can raise TCPA exposure in the US. Knowing line type and status is part of a defensible outbound program, though it's not a substitute for consent. This isn't legal advice — consult counsel before any calling or SMS campaign.
Verify appended numbers especially
Reverse-appended numbers (6 credits per match in Trackyr) should always be line-type verified before use, since you didn't collect them directly. Pairing append with verification gives you a clean, callable, textable phone list.
More on this topic: Phone finder →
// Common questions
Answered.
Why can't I text a landline?+
SMS is a mobile-network feature. Texts to landlines silently fail to deliver, which is why line-type verification matters before any SMS campaign.
What does active-line status tell me?+
Whether the number is currently in service. A mobile number that's been disconnected is dead weight on a call or text list.
Should I verify reverse-appended phone numbers?+
Always. You didn't collect them directly, so confirm line type and active status (2 credits in Trackyr) before calling or texting.
Put it into practice.
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