A phone carrier lookup tells you which telecommunications provider currently owns a phone number — AT&T, Verizon, T-Mobile, Rogers, Bell, Telus, or a VoIP carrier like Google Voice. But modern carrier lookup APIs go far beyond the carrier name. They reveal line type (mobile, landline, VoIP, toll-free), porting status, and whether the number is currently active — data that drives smarter communication decisions.

What Data Does a Carrier Lookup API Return?

Carrier name: the current serving carrier after any number porting
Line type: mobile, landline, VoIP, toll-free, prepaid, pager
Ported status: has the number moved from its original carrier?
OCN / LRN: Operating Company Number and Local Routing Number for routing decisions
Number status: active, disconnected, unreachable
Country and region: originating geography for US and Canada numbers

Why Line Type Matters More Than Ever

The TCPA prohibits auto-dialed or pre-recorded calls to mobile numbers without prior express consent. If your list contains landline numbers mistakenly labelled as mobile — or mobile numbers that were ported to a VoIP service — you can unknowingly violate TCPA while also wasting campaign budget calling unreachable numbers.

How Local Number Portability (LNP) Affects Carrier Lookups

In the US and Canada, consumers can keep their phone number when switching carriers — this is Local Number Portability. A number originally assigned to Verizon may now be served by T-Mobile. A static carrier database lookup returns the original carrier; a real-time LNP lookup returns the current serving carrier and routing number, which is what matters for delivery, compliance, and billing.

Carrier Lookup API: Common Use Cases

Use Case	Why Carrier Data Is Needed
SMS marketing	Confirm mobile line type; avoid sending SMS to landlines
TCPA compliance	Separate mobile from landline before using auto-dialers
Fraud prevention	Flag VoIP numbers associated with high-fraud patterns
CRM enrichment	Tag contacts by carrier and line type for segmentation
Call routing	Use LRN for accurate carrier-to-carrier billing
Lead scoring	Mobile numbers on major carriers score higher for reachability

Integrating the RealValidito Carrier Lookup API

RealValidito’s REST API returns carrier, line type, porting status, and number status for US and Canada numbers in a single HTTP request. The API is designed for high-volume integration into CRMs, web forms, call center software, and custom applications.

POST https://app.realvalidito.com/phonelookup/validate

Response:
{
  "status": "Valid",
  "phone_number": "+1704*******",
  "national_format": "(704) ***-****",
  "country_prefix": "1",
  "number_type": "VoIP",
  "zip": "",
  "area": "",
  "city": "",
  "state": "NC",
  "country": "US",
  "timezone": "EST",
  "network_name": "LEVEL 3 COMMUNICATIONS, LLC -",
  "network_type": "CLEC",
  "network_domain": ""
}

US vs Canada Carrier Coverage

The US and Canada share the NANP (North American Numbering Plan), meaning all 10-digit numbers follow the same format. RealValidito covers all major US carriers (AT&T, Verizon, T-Mobile, Comcast) and all major Canadian carriers (Rogers, Bell, Telus, Videotron, Shaw/Freedom) plus hundreds of regional and MVNO carriers.

Start With 1,000 Free Carrier Lookups

Create a free RealValidito account and validate your first 1,000 phone numbers instantly — no credit card required. The same API call returns carrier, line type, DNC status, and number activity.

Phone Carrier Lookup API: Detect Line Type, Carrier & Porting Status in Real-Time