Compare
Phone validation API comparison
Updated
How the main phone validation services bill, what a line type and carrier lookup costs, what each lookup returns, and what each one publishes about security, uptime and speed. Every fact was checked on the vendor’s own site.
Side by side
| Service | How you pay | Price | Free to start | List upload without code |
|---|---|---|---|---|
| Phone Validator | Pay as you go | $0.004 per lookup, with line type and carrier included | 100 free trial lookups, no card required; free single lookups on our site | CSV or Excel upload, $35 minimum per list |
| Twilio Lookup | Pay as you go | $0.008 per Line Type Intelligence request; basic number validation is free | Free trial account, no card required; no free Line Type Intelligence allowance listed | Not listed |
| Numverify | Monthly plans | $14.99/month for 5,000 requests, $59.99 for 50,000, $129.99 for 250,000; overage fees after that | 100 requests a month, non-commercial use | Not listed |
| IPQualityScore | Monthly plans; also offers tiered rates with no monthly contract | Plans from $139.99/month for 5,000 lookups | 1,000 free lookups | CSV uploads, by plan |
| AbstractAPI | Monthly plans | Starter plan: $19/month for 5,000 requests, up to $499/month for 500,000 | 100 requests, no card required | CSV upload on paid plans |
| Veriphone | Monthly plans or credit packs | $12.99/month for 10,000 credits; a current-carrier lookup uses 10 credits | 1,000 validations a month, no card required; free single lookups on its site | CSV upload on all plans |
| Telnyx Number Lookup | Pay as you go, card on file | From $0.0015 per query; rates vary by data type, destination and volume | Not listed | Not listed |
| Plivo Lookup API | Pay as you go | $0.004 per request | $10 in free credits when you sign up, no card required | Not listed |
| Trestle Phone Validation API | Pay as you go | $0.015 per query | 14-day free trial with 25 free validations, no card required | CSV upload, up to 10,000 records a file |
| Telesign Phone ID | Pay as you go, with volume discounts through sales | Not listed; its pricing page says pay per transaction, with volume discounts through sales | Free trial account with test credits, no card required | Not listed |
List prices in US dollars, checked November 9, 2026 (November 10, 2026 for Plivo Lookup API, Trestle Phone Validation API, and Telesign Phone ID). “Not listed” means the vendor’s own pages don’t mention it. Sources are at the end of this page.
Features
What each lookup returns
The data each service says a lookup returns, as its own documentation and product pages describe it.
| Service | Line types returned | VoIP numbers | Carrier name | Ported numbers | Coverage | List upload without code |
|---|---|---|---|---|---|---|
| Phone Validator | Mobile, landline, VoIP, toll-free | VoIP type, and the carrier is often the app or provider, such as Google Voice or TextNow | Yes | Current carrier checked in real time, with a ported flag, for US numbers | More than 250 countries and territories | CSV or Excel upload, $35 minimum per list |
| Twilio Lookup | Mobile, landline, fixed VoIP, non-fixed VoIP, toll-free and others | Fixed or non-fixed VoIP type, with the carrier name | Yes; not returned for toll-free, premium and some other types | Not listed in Line Type Intelligence | Worldwide | Not listed |
| Numverify | Mobile, landline | Not listed | Yes | Not listed | 232 countries | Not listed |
| IPQualityScore | Wireless, landline, VoIP, toll-free | VoIP detection, including lines such as Google Voice and temporary SMS services | Yes | HLR lookups return the latest carrier details, including porting | Any country, as it states; no count listed | CSV uploads, by plan |
| AbstractAPI | Mobile, landline, VoIP, toll-free | VoIP type; provider not listed | Yes | Not listed | 190+ countries | CSV upload on paid plans |
| Veriphone | Mobile, fixed line, toll-free, premium rate, shared cost, VoIP | VoIP type; provider not listed | Yes | Current Carrier Lookup returns the original and current carrier and a ported flag | 243 countries and territories | CSV upload on all plans |
| Telnyx Number Lookup | Mobile, fixed line, VoIP, toll-free and others | VoIP type, with the carrier name | Yes | Ported status and date, with the current provider, for North American (NANP) numbers | Worldwide for carrier and line type | Not listed |
| Plivo Lookup API | Fixed, mobile, VoIP, toll-free | VoIP type; provider not listed | Yes | Ported flag (yes, no or unknown) for US and Canadian numbers | Not listed | Not listed |
| Trestle Phone Validation API | Mobile, landline, fixed VoIP, non-fixed VoIP, premium, toll-free, voicemail | Fixed and non-fixed VoIP types; provider not listed | Yes, including MVNOs | Not listed | 200+ countries and territories | CSV upload, up to 10,000 records a file |
| Telesign Phone ID | Fixed line, mobile, prepaid mobile, toll-free, non-fixed VoIP, pager, payphone and others | Non-fixed VoIP type; provider not listed | Yes | Porting status add-on, enabled through sales: ported flag and current carrier | Global; no count listed | Not listed |
Checked November 10, 2026. “Not listed” means the vendor’s own pages don’t mention it. A line type tells you what kind of line a number is; it isn’t consent to call or text it.
Which to choose
The best fit for what you need
| If you need | Choose |
|---|---|
| Pay per lookup, carrier included | Phone Validator, at $0.004 a lookup with line type, carrier and US ported status included. No plan, and lists upload without code. Plivo Lookup API lists the same $0.004 per request. |
| Already sending messages through Twilio | Twilio Lookup, at $0.008 per Line Type Intelligence request, with caller name and SIM swap checks priced separately. |
| A steady monthly volume | Numverify’s monthly plans, from $14.99 for 5,000 requests, cost less per request than ours if you use the whole plan. |
| The lowest published per-query rate | Telnyx Number Lookup, from $0.0015 per query, varying by data type, destination and volume. |
| A required SOC 2 report | Twilio Lookup, IPQualityScore, AbstractAPI or Telnyx Number Lookup list a SOC 2 Type II report. We don’t hold one yet. |
Security and reliability
Audits, uptime and speed
What each service publishes for a security or engineering review. We don’t hold a SOC 2 or ISO 27001 report yet; our security overview, questionnaire answers and DPA cover the rest.
| Service | Independent security audits | Published uptime SLA | Public status page | Published response time |
|---|---|---|---|---|
| Phone Validator | None yet | 99.95% uptime SLA, including data provider outages | Yes, live for each API version | Median about 85 ms from outside our network, 95% under 150 ms; about 40 ms at our servers |
| Twilio Lookup | SOC 2 Type II; ISO/IEC 27001, 27017 and 27018 | 99.95% uptime SLA, excluding carrier problems; 99.99% with Enterprise Edition | Yes, with Lookup listed | Not listed for Line Type Intelligence |
| Numverify | Not listed | No public SLA; says uptime is around 99.9%, and enterprise plans can include SLA terms | Yes, with live latency and availability | Live latency on its status page |
| IPQualityScore | SOC 2 Type II; ISO/IEC 27001 and 27701 | 99.5% SLA guarantee on its Enterprise plan | Yes, current status and incidents | Not listed |
| AbstractAPI | SOC 2 Type II | 99.99% uptime SLA, with an enhanced SLA on its Enterprise plan | Yes, current status | Not listed |
| Veriphone | None (per its security page) | 99.95% uptime SLA; terms not listed | Not listed | Not listed |
| Telnyx Number Lookup | SOC 2 Type II; ISO/IEC 27001 and 27701; PCI DSS | Not listed | Yes, with Number Lookup listed | Not listed |
| Plivo Lookup API | SOC 2 (report type not stated); PCI DSS Level 1 | No uptime commitment listed for Lookup; its service-level page covers support response times | Yes, with Number Lookup API listed | Not listed |
| Trestle Phone Validation API | SOC 2 Type I | 99.95% uptime SLA, with service credits of 10% or 30% of monthly charges | Yes, with Phone Validation API listed | Not listed |
| Telesign Phone ID | ISO/IEC 27001 | Not listed | Yes, with Phone ID listed | Not listed |
Outside-network times are measured by our status page, which runs a live lookup every minute from Virginia and Ohio. Callers farther from our US East (Ohio) servers will see added network time. Server times are measured on production traffic. Audits and SLAs are shown as each vendor describes them on its own site; we haven’t independently verified them.
Why a specialist
Phone validation is all we do
Platforms such as Twilio, Telnyx, Plivo and Telesign sell lookups alongside messaging, voice and dozens of other products. We’ve focused only on phone numbers since 2005 and now handle 8M+ lookups a month.
Simple by design
One endpoint, one API key and a flat JSON answer. Every lookup includes line type, carrier, ported status for US numbers and a fake-number check, at $0.004, with no packages to choose.
Your integration keeps working
Every lookup API version we’ve released still answers. Version 1, replaced in 2020, runs today, so you upgrade when it suits you.
Built for the whole team
Developers use the API. Everyone else uploads a CSV or Excel list, or connects HubSpot, Zapier, Make, HighLevel or Zoho, and gets the same answers.
Little kept, nothing sold
API lookups store no phone numbers, and list files are deleted 7 days after they finish. We never sell phone numbers or use them for advertising.
Sources
Prices, features, security audits and uptime terms of other services were checked on their own websites on November 9, 2026, unless a date is shown beside the service. They change; check the vendor’s site before you decide.
- Twilio Lookup: Pricing, Line Type Intelligence docs, Security overview, API SLA, Status
- Numverify: Pricing, Product, apilayer FAQ, Status, Integrations
- IPQualityScore: Plans, Phone validation, Certifications, Status
- AbstractAPI: Pricing, Status
- Veriphone: Pricing, Docs, Security, Home
- Telnyx Number Lookup: Pricing, Docs, Security, Status
- Plivo Lookup API (checked November 10, 2026): Lookup API docs and pricing, Free credits, Security, Service levels, Status
- Trestle Phone Validation API (checked November 10, 2026): Pricing, Phone Validation API, Docs, Batch upload, Security, Service level agreement, Status
- Telesign Phone ID (checked November 10, 2026): Phone ID, Pricing, Phone ID docs, Phone type codes, Porting status, Security, Status
Phone Validator prices are our list prices today. Product names and trademarks belong to their owners. Phone Validator isn’t affiliated with or endorsed by them. Spotted something out of date? Let us know.
Try Phone Validator free
100 free trial lookups, no card required. Then $0.004 a lookup by API, dashboard or list upload.