How to Check if a Phone Number Is VoIP

A carrier lookup shows whether a number is mobile, landline or VoIP. Apps run one before sending codes. Here is how to check a number yourself.

Ways to check

• Lookup services: carrier lookup tools and APIs return the line type and carrier.
• Your own carrier: your account shows your line type.
• The app that refused it: a message such as "this number cannot be used" often means a VoIP number.

What the results mean

Numbers can be moved

When a number is ported between carriers, some databases lag behind. A fresh lookup is the most reliable.

Learn more: VoIP vs non-VoIP numbers and non-VoIP numbers.

Your own number

If apps keep refusing your number, check how your carrier provides it. Some low-cost plans run on VoIP behind the scenes, which can trigger refusals even though you have a SIM.

FAQ

How can I tell if a number is VoIP?

Use a carrier lookup service, which shows the line type.

Why do apps reject VoIP numbers?

They are cheap to get in bulk and often used for spam sign-ups.

Is Google Voice VoIP?

Yes.

Related: VoIP vs non-VoIP · non-VoIP numbers · valid phone numbers.