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SPECIFICTION
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Twilio Lookup

twilio.com

Free plan API
Visit twilio.com
Spec score 7.6 #13 of 25 in Phone Number Validation Software

What it is

Twilio Lookup is an API for formatting and validating phone numbers and enriching them with carrier and risk information. It can screen numbers before actions such as sending an OTP, creating an account, or processing a high-risk action. Available signals include line type and status, identity match, SIM swap detection, call forwarding, reassigned-number checks, caller name, and SMS pumping risk scoring. Lookup can also return active consent information alongside number details to help improve contact rates and message deliverability. Twilio provides API examples using helper libraries for Node.js, Python, C#, and Java, and lists Salesforce, Replit, and OpenAI as integrations. Twilio describes pairing Lookup with Verify to reduce fraud risk and improve OTP conversions. Lookup provides passive risk intelligence; it is not a standalone challenge-response authentication mechanism. Caller name is available only in the US, and call forwarding status only in the UK. Formatting and validation are free; other listed capabilities have per-request or per-query charges, while SIM swap and call-forwarding pricing is based on carrier access rates and enterprise agreements.

Spec sheet

Purpose
Twilio Lookup is a phone number intelligence API that formats, validates, and enriches phone numbers with carrier and risk data.Read 8 Oct 2026 · twilio.com
Integrations
Twilio lists Salesforce, Replit, and OpenAI among its integrations.Read 8 Oct 2026 · twilio.com
Security
Twilio says its services are designed to protect data, detect and prevent malicious activity, manage risk, and remain reliably available.Read 8 Oct 2026 · twilio.com
Compliance
Twilio says its platform helps simplify global compliance and telco regulations and supports meeting KYC standards.Read 8 Oct 2026 · twilio.com
Support
Twilio links to its Help Center and offers support plans.Read 8 Oct 2026 · twilio.com
Founded
2008Read 28 Sep 2026 · twilio.com
API access
Twilio provides a Lookup API and code examples using its helper libraries for Node.js, Python, C#, and Java.Read 8 Oct 2026 · twilio.com
Company history
Twilio says it was founded in 2008 to simplify the global telecommunications network and bring communications to the cloud.Read 8 Oct 2026 · twilio.com
Deliverability
Lookup can return formatting, line type, line status, and active consent information to help improve contact rates and message deliverability.Read 8 Oct 2026 · twilio.com
Fraud prevention
Lookup screens phone numbers before actions such as sending an OTP, creating an account, or processing a high-risk action.Read 8 Oct 2026 · twilio.com
Not a challenge product
Lookup provides passive risk intelligence and is not a standalone challenge-response authentication mechanism.Read 8 Oct 2026 · twilio.com
Pricing model
Twilio says Lookup uses pay-per-query pricing, with free basic formatting and validation and individually billed advanced features.Read 8 Oct 2026 · twilio.com
Regional availability
Caller name is available only in the US, and call forwarding status is available only in the UK.Read 8 Oct 2026 · twilio.com
Risk signals
Supported signals include line type, line status, identity match, SIM swap detection, call forwarding, reassigned number checks, caller name, and SMS pumping risk scoring.Read 8 Oct 2026 · twilio.com
Use with Verify
Twilio describes using Lookup and Verify together to reduce fraud risk and improve OTP conversions.Read 8 Oct 2026 · twilio.com

Plans and prices

Formatting and validation Free Free Phone number formatting and validation Read 8 Oct 2026 · twilio.com
Inbound caller identification $0.01, paid once $0.01 per request Only available in the US Read 8 Oct 2026 · twilio.com
Line Status $0.01, paid once $0.007 for 0-100,000 queries; tiered prices decrease to $0.00385 above 10,000,000 Tiered by query volume Read 8 Oct 2026 · twilio.com
Line type intelligence $0.01, paid once $0.008 per request Identifies carrier and phone line type Read 8 Oct 2026 · twilio.com
Reassigned number risk $0.02, paid once $0.02 for 0-1,000 queries; tiered prices decrease to $0.0015 at 6,000,000+ Tiered by query volume Read 8 Oct 2026 · twilio.com
SMS Pumping Risk Score $0.03, paid once ROW $0.025 per request; NAMER Free Regional pricing Read 8 Oct 2026 · twilio.com
Identity match $0.10, paid once $0.1 per request Prices vary per country Read 8 Oct 2026 · twilio.com
SIM swap and call forwarding Priced on request Contact sales Billed based on carrier network access rates and enterprise contract agreements Read 8 Oct 2026 · twilio.com

Every Twilio Lookup plan and price →

Strong points and limits

Strong points

  • Formats and validates phone numbers for free
  • Offers line, identity, and fraud risk signals
  • Provides examples for four programming languages
  • Can return active consent information

Limits

  • Caller name is available only in the US
  • Call forwarding status is available only in the UK
  • SIM swap and call-forwarding pricing requires sales contact

Who it suits

It suits developers and businesses that need phone-number validation, carrier details, or risk signals in account, messaging, and contact workflows. It is not a substitute for a challenge-response authentication mechanism.

Verdict

Lookup combines number formatting with optional carrier and risk intelligence through an API. Review the regional limits and per-query charges for the signals your workflow needs.

Where Specifiction places it

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