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Twilio Lookup
What it is
Twilio Lookup is an API for formatting and validating phone numbers and adding carrier and risk information. It can screen numbers before an OTP is sent, an account is created, or another high-risk action takes place. Signals include line type and status, identity matching, SIM swap detection, call forwarding, reassigned-number checks, caller name, and SMS pumping risk scoring. Lookup can also return active consent information to help with contact rates and message delivery. Developers can use its API with helper-library examples for Node.js, Python, C#, and Java. Listed integrations include Salesforce, Replit, and OpenAI, and Twilio describes pairing Lookup with Verify to reduce fraud risk and improve OTP conversions. Lookup provides passive risk intelligence rather than a challenge-response authentication step. Caller name is available only in the US, while call-forwarding status is available only in the UK. Formatting and validation are free; other listed checks have per-query or per-request charges.
For and against
For
- Free phone-number formatting and validation
- Returns carrier, line, and risk signals
- Active consent information can support contact workflows
- Helper-library examples cover four programming languages
Against
- Caller name is available only in the US
- Call-forwarding status is available only in the UK
The verdict
Twilio Lookup combines number validation with carrier, deliverability, and risk information for API-based workflows. Check regional availability and per-request charges for the signals you need.
Who it suits
It suits teams that need to validate phone numbers, improve messaging workflows, or screen numbers for risk through an API. It is not a standalone challenge-response authentication product.
Plans and prices
Formatting and validation
Phone number formatting and validation
Read 8 Oct 2026 · twilio.com
Inbound caller identification
Only available in the US
Read 8 Oct 2026 · twilio.com
Line Status
Tiered by query volume
Read 8 Oct 2026 · twilio.com
Line type intelligence
Identifies carrier and phone line type
Read 8 Oct 2026 · twilio.com
Reassigned number risk
Tiered by query volume
Read 8 Oct 2026 · twilio.com
SMS Pumping Risk Score
Regional pricing
Read 8 Oct 2026 · twilio.com
Identity match
Prices vary per country
Read 8 Oct 2026 · twilio.com
SIM swap and call forwarding
Billed based on carrier network access rates and enterprise contract agreements
Read 8 Oct 2026 · twilio.com
On the record
- API access
- Twilio provides a Lookup API and code examples using its helper libraries for Node.js, Python, C#, and Java.twilio.com · read 8 Oct 2026
- Company history
- Twilio says it was founded in 2008 to simplify the global telecommunications network and bring communications to the cloud.twilio.com · read 8 Oct 2026
- Compliance
- Twilio says its platform helps simplify global compliance and telco regulations and supports meeting KYC standards.twilio.com · read 8 Oct 2026
- Deliverability
- Lookup can return formatting, line type, line status, and active consent information to help improve contact rates and message deliverability.twilio.com · read 8 Oct 2026
- Fraud prevention
- Lookup screens phone numbers before actions such as sending an OTP, creating an account, or processing a high-risk action.twilio.com · read 8 Oct 2026
- Integrations
- Twilio lists Salesforce, Replit, and OpenAI among its integrations.twilio.com · read 8 Oct 2026
- Not a challenge product
- Lookup provides passive risk intelligence and is not a standalone challenge-response authentication mechanism.twilio.com · read 8 Oct 2026
- Pricing model
- Twilio says Lookup uses pay-per-query pricing, with free basic formatting and validation and individually billed advanced features.twilio.com · read 8 Oct 2026
- Purpose
- Twilio Lookup is a phone number intelligence API that formats, validates, and enriches phone numbers with carrier and risk data.twilio.com · read 8 Oct 2026
- Regional availability
- Caller name is available only in the US, and call forwarding status is available only in the UK.twilio.com · read 8 Oct 2026
- 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.twilio.com · read 8 Oct 2026
- Security
- Twilio says its services are designed to protect data, detect and prevent malicious activity, manage risk, and remain reliably available.twilio.com · read 8 Oct 2026
- Support
- Twilio links to its Help Center and offers support plans.twilio.com · read 8 Oct 2026
- Use with Verify
- Twilio describes using Lookup and Verify together to reduce fraud risk and improve OTP conversions.twilio.com · read 8 Oct 2026
