Freedom251 › Phone Number Validation Software
Twilio Lookup
What Twilio Lookup is
Twilio Lookup is an API for formatting and validating phone numbers and adding carrier and risk information. It can screen a number before an OTP is sent, an account is created, or another high-risk action takes place. 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 formatting and active consent information to help improve contact rates and message deliverability. Twilio provides code examples for its helper libraries in Node.js, Python, C#, and Java, and lists Salesforce, Replit, and OpenAI among its integrations. It describes using Lookup together 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 is available only in the UK. Formatting and validation are free; other capabilities have listed per-query or per-request prices, while SIM swap and call-forwarding pricing is available through sales.
Who it suits
It suits developers and teams checking phone numbers in account, messaging, or other customer workflows. It can also support teams seeking number and risk signals before sending OTPs or taking high-risk actions.
What it does well
- Free phone number formatting and validation.
- Provides line, carrier, and risk signals.
- Code examples cover four programming languages.
- Can be used with Twilio Verify.
What to know first
- Caller name is available only in the US.
- Call-forwarding status is available only in the UK.
- SIM swap and call-forwarding pricing requires contacting sales.
- It is not a standalone challenge-response authentication mechanism.
Limits
Formatting and validation are free. Other capabilities carry listed per-query or per-request charges; some prices vary by query volume or region, and SIM swap and call-forwarding pricing is based on carrier access rates and enterprise agreements.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Formatting and validation | Free · Phone number formatting and validation | Free |
| Line Status | $0.007 for 0-100,000 queries; tiered prices decrease to $0.00385 above 10,000,000 · Tiered by query volume | $0.01, paid once |
| Inbound caller identification | $0.01 per request · Only available in the US | $0.01, paid once |
| Line type intelligence | $0.008 per request · Identifies carrier and phone line type | $0.01, paid once |
| Reassigned number risk | $0.02 for 0-1,000 queries; tiered prices decrease to $0.0015 at 6,000,000+ · Tiered by query volume | $0.02, paid once |
| SMS Pumping Risk Score | ROW $0.025 per request; NAMER Free · Regional pricing | $0.03, paid once |
| Identity match | $0.1 per request · Prices vary per country | $0.10, paid once |
| SIM swap and call forwarding | Contact sales · Billed based on carrier network access rates and enterprise contract agreements | On request |
As twilio.com lists them, read 8 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Twilio Lookup website.
- Choose the free formatting and validation capability or a priced Lookup capability.
- Use the Lookup API for phone-number requests.
- Use the available helper-library examples for Node.js, Python, C#, or Java.
- Consider using Lookup with Twilio Verify for OTP workflows.
Verdict
Twilio Lookup provides phone-number validation and passive risk information through an API. Check regional availability and the listed per-request charges for the signals your workflow needs.
Questions
Is Twilio Lookup free?
Phone number formatting and validation are free. Other listed capabilities have per-query or per-request prices.
What platforms does Lookup support?
Lookup is available as an API. Twilio provides helper-library examples for Node.js, Python, C#, and Java.
What risk information can Lookup return?
Signals include line type and status, identity match, SIM swap detection, call forwarding, reassigned-number checks, caller name, and SMS pumping risk scoring.
Where are caller name and call-forwarding status available?
Caller name is available only in the US. Call-forwarding status is available only in the UK.
Can Lookup authenticate a user by itself?
No. It provides passive risk intelligence and is not a standalone challenge-response authentication mechanism.
What does Twilio list as Lookup integrations?
Twilio lists Salesforce, Replit, and OpenAI. It also describes using Lookup with Twilio Verify.
Facts from Twilio Lookup's own pages
- API access
- Twilio provides a Lookup API and code examples using its helper libraries for Node.js, Python, C#, and Java. · twilio.com, 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, 8 Oct 2026
- Compliance
- Twilio says its platform helps simplify global compliance and telco regulations and supports meeting KYC standards. · twilio.com, 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, 8 Oct 2026
- Founded
- 2008 · twilio.com, 28 Sept 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, 8 Oct 2026
- Integrations
- Twilio lists Salesforce, Replit, and OpenAI among its integrations. · twilio.com, 8 Oct 2026
- Not a challenge product
- Lookup provides passive risk intelligence and is not a standalone challenge-response authentication mechanism. · twilio.com, 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, 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, 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, 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, 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, 8 Oct 2026
- Support
- Twilio links to its Help Center and offers support plans. · twilio.com, 8 Oct 2026
- Use with Verify
- Twilio describes using Lookup and Verify together to reduce fraud risk and improve OTP conversions. · twilio.com, 8 Oct 2026
Where Twilio Lookup stands on Freedom251
- Phone Number Validation Software#12 of 25