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Twilio Lookup

Intelligent authentication so smooth, users will think they skipped a step.

Email & Phone Validation 1.7 (34 reviews)
2008 Founded
5001-10000 Employees
300,000+ Customers
San Francisco, California, United States Headquarters

Quick Facts

✓ Free Trial
Website
twilio.com →
Pricing Model
usage-based
Free Trial
unknown days
Company Type
public
Business Type
Software company, Corporate office
Verified on Google View →

About Twilio Lookup

Twilio Lookup is a specialized phone number intelligence and validation API from Twilio, Inc., a public cloud communications platform headquartered in San Francisco, California. It allows developers and risk teams to verify and enrich phone numbers in real time, improving message deliverability, user verification, and fraud detection across global customer bases. en.wikipedia.org

Twilio as a company was founded in 2008 and pioneered the Communications Platform as a Service (CPaaS) model, offering programmable SMS, voice, email, and customer data tools through APIs. Over time it has grown into a broad customer engagement platform used by hundreds of thousands of brands and millions of developers, including many Fortune 500 enterprises, for high-volume, mission‑critical communications. en.wikipedia.org

Lookup focuses specifically on phone number data quality, routing, and risk. With a single API, it can normalize and validate numbers, determine line type (mobile, landline, VoIP, toll‑free, etc.), check carrier and line status, pull caller name where available, and provide advanced risk signals such as reassigned‑number risk, SIM swap, call forwarding, and SMS Pumping Risk Score. These capabilities are exposed as modular data packages like Formatting and Validation, Line Type Intelligence, Identity Match, Reassigned Number, Line Status, Caller Name, SIM Swap, Call Forwarding, and SMS Pumping Risk Score. twilio.com

Positioned at the intersection of communications and fraud prevention, Twilio Lookup is often paired with Twilio Verify, Messaging, and Voice to build adaptive authentication flows and protect against fake accounts, bot activity, and traffic‑pumping schemes. Companies such as Reddit, Resy, Tradier, Persona, and Choco rely on Lookup signals to validate user phone numbers, reduce fraud losses, and optimize messaging costs, helping Twilio maintain a leading position among global CPaaS and identity‑verification vendors. customers.twilio.com

Key Features

Phone number formatting & validation - Normalizes phone numbers into E.164 and national formats and validates basic structure to reduce undeliverable SMS and calls. twilio.com

Line Type Intelligence - Identifies whether a number is mobile, landline, fixed VoIP, non-fixed VoIP, toll-free, and more to filter risky or non-SMS-capable numbers. twilio.com

Carrier & line status lookup - Returns carrier data and whether a line is active or reachable so teams can avoid sending traffic to inactive or unreachable numbers. twilio.com

Identity Match - Confirms that user-provided identity attributes (such as name and address) match authoritative data for a given phone number to prevent bots and synthetic identities. twilio.com

Caller Name (CNAM) - Retrieves the verified business or person name associated with U.S. numbers to personalize inbound call flows and improve trust. twilio.com

Reassigned Number Risk - Indicates whether a number has been reassigned since a user's last consent date to help avoid TCPA violations and reach the right party. twilio.com

SIM Swap detection - Detects recent SIM changes that may indicate account takeover risk, enabling step-up verification before sending OTPs. twilio.com

Call forwarding status - Exposes whether a mobile number is currently forwarded, helping flag at-risk numbers during high-risk transactions (UK-only feature). twilio.com

SMS Pumping Risk Score - Uses machine-learning risk scoring to flag numbers associated with SMS pumping fraud so you can block or challenge suspicious traffic. twilio.com

Phone number risk & fraud signals - Enriches fraud models with risk scores and attributes, enabling adaptive friction and better fraud catch rates across the customer journey. twilio.com

Global coverage via Twilio supernetwork - Leverages Twilio's carrier network and infrastructure to provide consistent number intelligence across many countries. twilio.com

Tight integration with Verify, Messaging, and Voice - Shares risk and deliverability data with Twilio Verify OTP flows, SMS, WhatsApp, and Voice APIs for end-to-end authentication and communication workflows. twilio.com

Developer-friendly REST API & SDKs - Simple HTTPS API with official helper libraries in major languages and extensive documentation, code samples, and quickstarts. twilio.com

Enterprise-grade reliability & SLA - Covered under Twilio's 99.95%+ API SLA (99.99% with Enterprise Edition) for high-availability authentication and fraud-decisioning use cases. twilio.com

Best For

Company Size

smb mid-market enterprise

Industries

SaaS Technology Financial Services Fintech Ecommerce Marketplaces

Use Cases

Account signup and login phone verification Fraud and bot prevention for new account creation KYC and identity verification workflows Two-factor and stepu2011up authentication using phone intelligence Messaging deliverability optimization and list hygiene TCPA and consent risk mitigation via reassignedu2011number checks

FAQ

What is Twilio Lookup?

+

Twilio Lookup is a phone number intelligence and validation API that lets you normalize and validate phone numbers, identify line type and carrier, and access advanced risk and identity signals such as SIM swap, reassigned number risk, SMS Pumping Risk Score, Identity Match, and Caller Name. It is designed to improve message deliverability, strengthen authentication flows, and reduce fraud by enriching phone numbers with authoritative, real-time data. twilio.com

How much does Twilio Lookup cost?

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Twilio Lookup uses usage-based, pay-as-you-go pricing. Basic formatting and validation are free, while premium signals are billed per request - for example, Caller Name starts around $0.01 per request, Identity Match around $0.10 per request, Line Type Intelligence around $0.008 per request, and Reassigned Number and Line Status are available on tiered volume pricing. SMS Pumping Risk Score is billed per request outside North America, and SIM Swap/Call Forwarding use custom pricing. Discounts and committed-use deals are available through Twilio sales. twilio.com

What are the main features of Twilio Lookup?

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Key features of Twilio Lookup include phone number formatting and validation, Line Type Intelligence, carrier and line status lookup, Caller Name (CNAM), Identity Match, Reassigned Number Risk, SIM Swap detection, Call Forwarding status, and SMS Pumping Risk Score. All of these are exposed through a single REST API and can be combined with Twilio Verify, Messaging, and Voice to power risk-based authentication, KYC, and deliverability optimization. twilio.com

Who are Twilio Lookup's main competitors?

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Twilio Lookup competes with both standalone phone validation and identity APIs and broader CPaaS vendors. Common alternatives include Telesign, Vonage Communications APIs (formerly Nexmo), Sinch, Plivo, and specialized number-validation APIs like NumVerify. Buyers often evaluate them on data depth, global coverage, pricing, integration effort, and how well they plug into existing messaging and fraud-prevention stacks.

Is Twilio Lookup good for small businesses?

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Twilio Lookup can work well for small businesses and startups that have developers and need reliable phone validation and fraud signals without committing to contracts or minimums, thanks to its pay-as-you-go model and free basic validation. However, the platform and console are developer-oriented, and some smaller, non-technical teams may find the configuration and pricing complexity challenging compared with simpler, no-code validation tools. twilio.com

Customer Reviews

1.7 out of 5
Based on 34 Google reviews
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View on Google
Kelly Birdsong

Kelly Birdsong 🏅

a week ago

Thank you.

Mark Lazar

Mark Lazar 🏅

a month ago

I made the mistake of choosing Twilio/SendGrid as the marketing mail app for my private lending company. BIG MISTAKE. Establishing the account was ponderous, to say the least, and took over a week for their Compliance Department to review a handful of basic questions in order to activate the account. The SendGrid app is not intuitive/user-friendly, but even a non-tech person can muddle through it. I finally sent my first email blast only to have it shut down after one third of the emails were sent due to security flags. Keep in mind, this is AFTER I completed/answered all Compliance questions, and tested/confirmed domain authentication. At this point, I'm requesting a full refund and will switch to MailChimp or some other app. My advice; stay away from Twilio/SendGrid. Mark Hayden, ID

greg winslow

greg winslow 🏅

2 months ago

They called me unexpectedly

Jeff

Jeff 🏅

3 months ago

Customer support is not existent. You guys charged thousands of dollars from my credit card that was linked to the Twilio account for my business because of a “bug”. Ticket was opened a week ago. Still no response. Unreal.

Brady Van Matre

Brady Van Matre 🏅

3 months ago

I have never hired Twilio. Never spoken to, nor corresponded in any way with them, or SendGrid. They have fraudulently charged my credit card $35,000. I can't get anyone on the phone to discuss it. All emails and customer service requests I have sent have been replied to by Chat-Bots. This company is a fraud. Impossible to get anyone on the phone. I am in the process of filing a criminal complaint. If any member of the public would like to know more about my experience with their theft and lack of responsibility in responding, please feel free to message me.

Ben khan

Ben khan 🏅

4 months ago

I locked myself out of my system by falling victim buy update from Google, basically everything was my fault and Authy did a great job by not giving me access right away. Eventually they followed up and it took some time but the verified me after a very lengthy security check and give me access back thank you

Ben k

Ben k 🏅

4 months ago

My phone crashed due to update from Google. I had no choice but do a factory reset. And can't get access to authy installed on same device. I'm locked out of my account because of the option I activated Multi-device disabled. Authy auto-disables the ability to add new devices. And their tech support unable to disable Multi-Device option due to the restrictions. Do not install autty use Google authenticator. Do not use this apps do not use anything with them or you be stuck if there is problem. I will also write and warn people on the YouTube accounts that was promoting this app and I will try to stop people from installing this app on their device. I will update this review again on here from my experience.

Nikolay S

Nikolay S 🏅

4 months ago

Horrible experience. Total crap.

John Klosner

John Klosner 🏅

4 months ago

Your phone number will never get approved and they will drain $15 from you for every a2p submission.

ELDT Nation

ELDT Nation 🏅

5 months ago

Awful platform. They made me wait 2 months to verify a phone number my business needed for text purposes. Constant back and forth with no insight on how to verify my account - just to tell me I need to now create a new account months later. Complete joke.

T Funk

T Funk 🏅

6 months ago

Is this actually a business? They immediately lock your account and there is no way to contact them. Complete waste of time.

Todd Gatseos

Todd Gatseos 🏅

8 months ago

They can't wait to suspend your account the second your funds run out. No warning. No grace period. Just a greedy company that doesn't care about their customers, only about getting their money right now. It's a terrible way to treat your paying customers and I will start looking for a better solution immediately. If you're looking for a great customer experience, you won't find it here.

Nate

Nate 🏅

8 months ago

Since your app has had two support email addresses and both of them do not work, your app is not giving clients/customers the online security they are entrusting you with. Why are you doing this?

Diego Sainz Balboa

Diego Sainz Balboa 🏅

9 months ago
erick lopez

erick lopez 🏅

9 months ago

It's garbage, they take your money and right after taking it, they block your account, citing impossible bureaucratic procedures just to steal your money, lawsuit pending.

lgbtproducciones

lgbtproducciones 🏅

9 months ago

Una verdadera pesadilla, un asco, me hicieron perder 2 meses de tiempo en tramites de verificación absurdos, el soporte técnico es déspota y altanero, no pierdan su tiempo con esta basura.

Robert Wismet

Robert Wismet 🏅

9 months ago

I am extremely disappointed with my recent experience with Twilio. After investing significant time and resources to integrate Twilio Voice into our CRM software, our account was suddenly suspended without prior notice. This happened just a week after we released the first version of our software with Twilio integration. We promptly responded to all questions asked by Twilio Support and Twilio Consumer Trust, clearly explaining that we develop B2B software for human-to-human calls — no robocalls or automated messages. Despite our detailed explanations, it has now been over 2 weeks without any response or resolution from Twilio. Our account remains suspended, and our customers are unable to use this essential feature. Due to the complete lack of communication and support, we have already switched to another provider who handles the account verification process in a much more transparent manner without abruptly shutting down services during operations. If this is how Twilio treats its customers, I would seriously advise others to think twice before choosing their services. At this point, I cannot recommend Twilio to anyone looking for a reliable communications partner. Twilio, if you care about your customers, I hope you address this issue immediately.

B Hunter

B Hunter 🏅

11 months ago

Absolutely ABYSMAL company to deal with - that is, if you can even get a hold of them to deal with in the first place. As a reseller of VOIP phone numbers, it's COMICAL how hard it is to get one of these UNprofessional service reps on the phone. Dont waste your time - the reviews speak for themselves, and unless you want a 'free' blood pressure booster and stress inducer, stay away!

DeeShannon Garrison

DeeShannon Garrison 🏅

a year ago

I am forced to use this wretched "service" as part of what I need to do for my job and I have been trying to get some semblance of customer support for 2 days now. This is urgent and nobody cares.

Victoria Genin

Victoria Genin 🏅

a year ago

Like others say: DO NOT SIGN UP WITH TWILIO. Since signing up September 30th, 2024 I have been unable to do ANYTHING with the Twilio account. I am unable to utilize the SMS features. Unable to get status on compliance. Unable to get ANY support. Unable to get thru to anyone on the phone or via their contact page. Was able to BUY a phone nu,ber, but no clue how to find out if it is approved for use yet. The UX is TERRIBLE. Browser Window after window after window opening and all headed to nowhere or circular hell. Via their own reporting window on staus, the features I would want to use today are actually down. And to add insult to unjury, I cannot cancel. The instructions they provide go to a page that redirects to some other roundabout page...There's a notation that says go to "sales" to cancel - so I did and upon submitting the form, the page just hangs there - maybe it submitted, maybe it didn't. (FUnny, it's the only window that did NOT open a response in a new window...) Anyway, After much manipulation, was able to catch a page that seemed like I can cancel, but is erroring: I need to have a credit card on file to get a refund. Ummm... I have the card I signed up with on file- and I if didn't, a check will do, please. I am fairly tech savvy and this one has been a headache from 'go.' I remember making a call a couple years ago and spoke to a nice gal who told me all about the ease and wonder of Twilio's SMS service. Sounded great, but I didn't jump on it. Roll on some days and it seems Twilio has evolved into a robot-ran platform with zero human help. Fortunately, I didn't pay much down and apparently they don't have my card, so I'll write off the small sum and challenge any charges that may come in future. TOTAL NONSENSE. Could not possibly reccomend this company / products.

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