US Phone Number Validator & Carrier Lookup
Validate US phone numbers against NANPA data and return the originally allocated carrier (Verizon, AT&T, T-Mobile, and hundreds more) with line type — mobile, landline, or VoIP. Static dataset lookups: sub-20ms, from $0.0002 per call, and a fraction of the cost of live HLR services.
Try it — US numbers
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NANPA-based carrier lookup for US phone numbers
Veriphone validates US numbers against the North American Numbering Plan (NANP) and resolves the originally allocated carrier and line type using NANPA datasets. This is a static-data lookup — no live HLR query — which is exactly why it's sub-20ms and costs a fraction of a cent per call instead of the multi-cent pricing that live HLR services charge.
The response includes validity, the carrier to which the number was originally assigned, line type (mobile, landline, or VoIP), area code region, and E.164 formatting. The line_type field is useful for TCPA filtering and SMS-routing decisions — US regulations prohibit SMS marketing to landlines without separate consent. Important context below on how porting affects this.
US phone number format
US numbers follow the NANP: 3-digit area code (NPA), 3-digit central office code (NXX), and 4-digit subscriber number. Mobile and landline numbers share the same format — you cannot tell them apart from the digits alone, which is why NANPA's line-type classification matters. The country code +1 is shared with Canada and some Caribbean nations.
Major US mobile carriers
The US market consolidated into three national carriers after T-Mobile's 2020 acquisition of Sprint. Dozens of MVNOs resell capacity on top of these networks. Veriphone returns the carrier to which the number was originally allocated in NANPA data; for MVNO-hosted numbers, that's typically the underlying host MNO at the time of assignment.
Who uses Veriphone for US numbers
- Marketing and SMS platforms screening numbers for TCPA compliance — landlines must be excluded from SMS campaigns or fines apply per message.
- Fintech and insurtech validating customer numbers during KYC and flagging VoIP numbers commonly used in synthetic-identity fraud.
- Real estate and services platforms cleaning lead lists before outreach — disconnected numbers and spam-trap landlines are filtered out.
- Any SaaS with US signups replacing client-side regex with full E.164 validation and carrier check, catching typos and fake numbers at the source.
Questions about US number validation
Can Veriphone distinguish landline, mobile, and VoIP?
Yes. Every lookup returns a line_type: mobile, fixed_line, or voip, based on NANPA's original classification of the number range. This is useful for TCPA filtering — US regulations prohibit SMS marketing to landlines without separate consent — but keep in mind that Wireless LNP allows a number to be ported across line types, so the original NANPA classification can be stale for ported numbers. For strict TCPA workflows at high volume, layer a porting-aware service on top for the subset that requires it.
Does Veriphone resolve ported US numbers to their current carrier?
No. Veriphone uses static NANPA data and returns the originally allocated carrier. US Local Number Portability has been universal since 2003, so for numbers that have been ported the current operator will differ. If your workflow depends on the live operator (for example, real-time SMS routing decisions), layer a live HLR service on top of Veriphone — use Veriphone for the bulk of validation work, and pay for HLR only on the critical subset. That's typically 10–100× cheaper than running live HLR on every number.
Is carrier lookup the same thing as a reverse phone lookup?
No. Carrier lookup returns the network operator and technical metadata. It does not return the name, address, or identity of the person who owns the number — that would be a reverse phone lookup, which Veriphone does not provide.
Does the free tier include carrier data?
Yes. All 1,000 monthly free lookups include full carrier name, line type, and country data — same as paid plans.
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