8 Reliable Phone Number Validation API for Your Next Product

As a fellow data geek, I know how frustrating it can be to collect phone numbers from leads and customers, only to discover many are invalid or non-working. It hurts your ability to contact real potential buyers and wastes time and money.

But there‘s good news—integrating a phone number validation API can help you easily identify inaccurate and fraudulent numbers to improve lead quality.

In this comprehensive guide, I‘ll explore the critical importance of phone validation, dive into illuminating research on its benefits, and review the top APIs to seamlessly incorporate into your tech stack. Let‘s get started!

Why Phone Number Verification is Mission-Critical

Let me share an illustrative statistic—according to data from LexisNexis, a staggering 30% of phone numbers go bad every year.

That means almost one in three numbers you‘ve diligently collected are invalid by the next year.

I‘m sure you‘ve experienced the pain of attempting to call or text a lead only to get an error message. Or you launch an SMS campaign and get charged for messages sent to non-working numbers.

Not only is outreach to invalid numbers a waste of time and money, but it also means you can‘t nurture and convert real potential customers you now can‘t reach.

This data highlights why actively validating numbers is so critical:

• 68% of people provide inaccurate phone numbers due to simple typos and mistakes.

• Up to 20% of numbers are intentionally fake or falsified to get past forms.

• People change numbers frequently when switching carriers or moving.

• Old recycled numbers get reassigned to new customers.

• Fraudsters provide bogus numbers attempting to scam businesses.

Unless you verify up front, you have no idea if that new lead‘s number is legitimate. And the costs add up—according to TechJury:

• Businesses lose $600 million per year calling wrong numbers
• Wrong number calls waste $4.5 million in workforce hours
• 9% of text messages sent by businesses go to invalid numbers

Now you understand why phone validation is so vital for lead generation and customer relationship management.

Next, let‘s explore the benefits research shows you can gain.

Key Benefits of Phone Number Verification

Plenty of hard data exists highlighting the many upside of integrating number verification:

1. Identify 35% more invalid leads

A study by Striata found that phone validation APIs catch 35% more invalid leads than businesses can detect manually. Automated identification prevents wasted sales outreach.

2. Reduce wrong number calls by 60%

Software Advice surveyed businesses who stated validating numbers cut wrong number calls by 60%. That saves hours of wasted work and significant costs.

3. Improve lead conversion rate by 29%

Validating weed out invalid leads and surface more qualified prospects. This leads to a 29% higher lead conversion rate according to Aberdeen Group.

4. Increase SMS campaign deliverability by 32%

Validating numbers before text campaigns improves deliverability. Businesses see up to 32% more texts reach recipients when using verification.

5. Cut cost per lead by 51%

With higher quality leads, businesses reduced their average cost per lead by 51%. The efficiency gains from number verification are substantial.

6. Minimize fraudulent entries up to 85%

Number validation combined with other signals decreases fraudulent lead entries by 85% as reported by Gartner. This preserves data integrity.

7. Boost customer satisfaction 29%

Contacting customers at correct validated numbers lifts satisfaction an average of 29% according to research from Accenture.

In total, number validation returns hard benefits to efficiency, costs, conversions, deliverability, and customer experience. It should be considered a required component of modern lead management.

Now that you understand the data-driven upside, let‘s explore some top validation APIs.

Reviews of the Top 8 Phone Validation APIs

Numerous API options exist to enable phone validation. Based on capabilities, reputation, and value, here are my picks for the top 8:

1. NumVerify

Of all the validation APIs, NumVerify stands out as the most full-featured and widely adopted.

Trusted by over 10,000 businesses worldwide, NumVerify offers 99.9% uptime and can verify over 6 million numbers daily. It covers 230 countries and provides:

• Real-time validity checking – Instantly check if numbers are currently valid and operational.

• Historic data – Get full number validity history with current and past carriers.

• Number type identification – Identify number as landline, mobile, VoIP, toll-free or premium rate.

• Carrier and line type detection – Identify exact mobile carrier and telecom provider.

• Geographic location – Get the geographic location of any number down to the city.

• Fraud risk score – Proprietary algorithm assigns risk score from 1-100 to flag likely fraudulent numbers.

• 100% deliverability on texts and voice calls according to NumVerify.

This complete set of number intelligence helps you better understand each lead while reducing costs and improving conversions.

NumVerify offers 250 free credits per month—enough for most smaller sites. Paid plans start at $30/month making it extremely affordable even for high-volume verification.

With its reliability, uptime, depth of features, and competitive pricing, NumVerify earns its place as my top choice.

2. Abstract API

If you need an enterprise-grade verification API, Abstract should be on your shortlist.

Abstract processes over 150 million requests monthly across an impressive 99.985% uptime. Their database contains over 1.5 billion unique phone numbers.

Abstract doesn‘t just validate number accuracy but also provides:

• Historic number data – Previous validity and carriers associated with a number.

• Number reputation – Proprietary bot detection and fraud scoring models.

• IP insights – Geolocation on the IP submitted with the request.

• Advanced number type detection – Precise classification as landline, mobile, VoIP, toll-free, premium or non-fixed.

• Carrier and line type data – The current or most recently associated carrier and line type.

• Geographic data – The city, state, country, and timezone of a phone number.

Abstract makes it easy to integrate verification with ready-made SDKs for all major programming languages.

Abstract API starts with a free 500 requests monthly—a generous free tier. From there pricing is volume-based starting at $8/month.

With enterprise-scale capabilities and comprehensive number intelligence, Abstract API earns a top recommendation.

3. phonevalidate.io

If you need an API tailored specifically for US and Canadian numbers, phonevalidate.io is a great choice.

All requests are handled within their private cloud infrastructure for speed, reliability, and security.

You can validate in real-time or upload batches of numbers. The API returns:

• Validity – Actively checks if numbers are currently functioning and operational.

• Number type – Identifies the number as landline, mobile, toll-free, or VoIP.

• Carrier data – Detects the current carrier associated with each number.

• Line details – Identifies key traits like prepaid vs postpaid mobile plans.

• Connection details – Whether numbers support SMS, MMS, or voice capabilities.

• Geographic info – The city, state, zip code, and timezone.

Batch processing enables large volume verification and they offer top-tier security including SOC 2 compliance.

phonevalidate.io starts with a free 100 number trial with prepaid plans from $30/month after that. It‘s a superb choice for US and Canada.

4. Lob

The Lob API excels at rapid programmatic verification you can embed in apps and sites.

Lob boasts a 99.95% uptime across a global private cloud network with built-in load balancing and auto-scaling for peak loads.

Developers praise Lob for its dead simple integration with 7 line code snippets to start verifying.

Key features include:

• Real-time validity checking that a number is currently in service.

• Carrier lookup to identify the mobile or landline carrier.

• Geographic information like city, state, and zipcode location.

• Number type detection identifying mobile, landline, toll-free and VoIP numbers.

• Webhook support to push results to other apps and databases.

• Batch processing for bulk verification in addition to real-time checks.

Lob offers a free trial to test it out and pricing from $50/month. The hands-down easiest integration lands it on this top list.

5. Twilio Lookup

Already using Twilio for communication? Their Lookup API integrates seamlessly.

Twilio handles over 65 billion calls and texts monthly providing rock-solid dependability.

Lookup provides:

• Real-time validity checking to confirm numbers are currently functioning.

• Carrier data to identify the mobile carrier or landline provider.

• Number type classification as mobile, landline, toll-free, VoIP or virtual numbers.

• Advanced line type detection identifying details like business or residential lines.

• Geographic data pinpointing location at the zipcode and city level.

• Historic number data including previous validity, carriers, locations, and other details.

Twilio lookup starts with a free trial with pay-as-you-go pricing that scales up seamlessly. Easy to tack onto existing Twilio usage.

6. Ekata

Ekata is trusted by Fortune 500 companies for enterprise-level verification.

Ekata‘s verification API taps into their master database with 6 billion phone identities.

Key features include:

• Historic data insights – Details previous carriers, locations, and owners of each number.

• Real-time verification – At-the-moment checks that numbers are currently valid and working.

• Number reputation scoring – Ekata‘s algorithm calculates probability a number is high risk.

• Address data enrichment – Appends address data based on the phone location.

• Business vs consumer classification – Identifies if a number is tied to a business or residence.

• Number type categorization – Identifies mobile, landline, VoIP and toll-free numbers.

• Carrier and line type detection – Detects exact mobile carrier and landline provider.

Ekata does not publicly disclose pricing—you need to request a custom quote. But for enterprise interfaces, Ekata is a proven choice.

7. Clarifai

Clarifai offers a newer approach using AI and machine learning for verification.

Clarifai leverages computer vision, their specialty, to extract numbers from images and documents instead of just validating raw inputs.

This enablesVerification
you
to quickly validate phone numbers extracted from:

• Invoices and receipts
• Business cards
• Paperwork and applications
• Photo IDs
• Screenshots
• Signup documents
• PDFs

Clarifai offers a very generous free plan for developers along with affordable pricing from $50/month. For SMS campaigns that engage customers to text in images, Clarifai provides a slick verification approach.

8. Prove

The Prove API brings robust enterprise-scale validation capabilities.

Prove analyzes over 1 billion phone events daily to help detect fraud and spam numbers.

Key features include:

Real-time validation – Instant API responses on number accuracy and risk.

Historic analytics – Details on a phone number‘s full history and reputation.

Synthetic fraud scoring – Proprietary AI to identify fraudulent and spammy numbers.

Device intelligence – Insights into the type of device linked to each number.

Number enrichment – Appends demographic and firmographic data.

Prove integrates with leading data platforms through turnkey connectors and batch upload options.

Prove doesn‘t disclose pricing publicly but their enterprise focus means pricing starts in the thousands per month. For major corporations, Prove brings deep capabilities.

Evaluating Your Validation API Needs

With so many options, how do you choose the right verification API? Here are key criteria to consider:

• Number volume – Assess how many numbers you validate monthly to pick an API that fits your scale.

• Use cases – Do you just need validity checking or also want carrier lookups, geolocation, etc? Prioritize APIs with the features you’ll leverage.

• Country coverage – If operating internationally, ensure the API supports all regions you need.

• Pricing model – Flat monthly fees, metered by usage, or hybrid models are available to suit different needs.

• Accuracy and uptime – The API should provide reliable results and work 24/7.

• Security protocols – Look for APIs that use HTTPS encryption and follow security best practices, especially when handling customer data.

• Ease of integration – Seek APIs with dev-friendly documentation and straightforward integration.

• Customer support – Make sure the provider offers solid technical and integration assistance.

Prioritizing your must-have capabilities and ideal pricing model makes selecting the right fit easier.

Most providers offer free trials so you can validate the API works as expected before paying. Leverage trials to test top contenders before fully integrating one.

Best Practices for Implementation

Once you’ve chosen your validation API, smart implementation ensures you gain the full benefits. Here are best practices:

Pick trigger points – Determine when you‘ll validate: at signup, before calling, when exporting contacts, etc.

Add validation to forms – Embed validation functions into web forms, lead captures, questionnaires, etc.

Build workflows – Create processes to automatically validate and flag numbers then update your database.

Show number status – Display validation status and warnings on contact profiles and lead pages.

Notify users – Send emails if they submit an invalid number to prompt correction.

Mask invalid numbers – Don‘t expose or recirculate invalid numbers collected.

Leverage two APIs – Use one API in real-time and another to periodically re-verify stored numbers.

Watch usage – Monitor requests and bandwidth to ensure you remain within your plan limits.

Clean regularly – Schedule quarterly sweeps to re-validate your entire contacts database.

Secure API credentials – Never expose API keys or secrets in public code repositories.

Following best practices ensures your implementation provides maximum ongoing value and minimizes wasted resources.

Let‘s Start Validating Smarter

Still manually calling and texting leads without number verification? Now you can see why integrating an API should be a top priority.

The many benefits—more sales conversions, huge time savings, lower costs, reduced fraud—make validation an obvious win.

Hopefully this guide provided a helpful overview of the top phone verification APIs available and best practices to extract full value.

The hardest part is just getting started—so sign up for a trial API key today and start testing validation on your lead data. I‘m confident you‘ll be amazed by the results.

Here‘s to more quality leads and less bogus numbers slowing you down! Please let me know if you have any other questions as you get up and running with phone validation.