Phone Validation API

Validate phone numbers worldwide, determine carrier name, line type, and prepaid status, and identify disconnected phone numbers with a phone activity score. Our international coverage ensures accurate and reliable phone data across global markets.

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{id: "Phone.c33d61b1-1cc7-4923-adad-2daf2edf581a",
phone_number: "+61414924070",
is_valid: true,
activity_score: 70,
country_calling_code: "61",
country_code: "AU",
country_name: "Australia",
line_type: "Mobile",
carrier: "Vodafone Network Pty Ltd"
}

Demo
Use Cases
Features
Developers
Benefits
Pricing

Phone Validator API Use Cases

Lead Contactability and Prioritization

Prioritize leads with the best chance of contactability based on whether the number is reachable, not disconnected or temporary, and belongs to the person who they say they are.

Lead Validation and Normalization

Validate attributes to ensure the phone number is connected and assigned to a subscriber and the address exists in the real world.

Lead Verification and Append

Leverage phone metadata and phone subscriber details to remove spam junk leads and append additional data that helps with lead conversion.

Message Delivery

Confirm if a number is legitimate before you send a message. Distinguish mobile numbers from temporary VoIP numbers and landlines and verify the correct number format to reduce delivery errors.

Fake Accounts and Promo Abuse

Stop fake account creation and promo abuse with line type and carrier intelligence that spot suspicious temporary numbers.

Features

Phone Activity Score

Indicates if a phone is connected or disconnected.

Validity Checks

Shows whether a number is valid, assigned to a carrier, and is in-service – all across the globe.

Carrier

Identifies all carriers globally, including MVNOs.

Line Type

Provides seven unique line types, including mobile, fixed and non-fixed VoIP, landline, premium, toll-free, and voicemail service.

Prepaid Status

Indicates whether a mobile number is part of a prepaid plan.

Add-ons Available

Litigator Checks:

Identifies if the phone subscriber is associated with a serial litigation under TCPA or similar regulation

Access our identity data via API integration or Batch Upload — whichever fits your needs best.

Seamlessly integrate Phone Validation API into your platform.

Upload CSV files for bulk verification. Get your results within minutes.

Phone Validator API FAQs

What is the Phone Validator API?

The Phone Validator API is a comprehensive service that validates phone numbers, determines carrier information, identifies line types (mobile, landline, non-fixed VoIP, fixed VoIP, and more), checks prepaid status, and evaluates phone activity levels with our proprietary Activity Score.

How does the Phone Validator API help businesses?

Our API helps businesses improve lead quality, prevent fraud, optimize message delivery, and maintain clean contact databases by providing details about phone numbers.

What is the accuracy of your phone validation?

Phone validity has an accuracy of 100%. Phone carrier and line type have accuracies of 99+%, and Phone Activity Score has an accuracy of false positives below 1%.

What are common use cases for the Phone Validator API?

Common use cases include:

Lead quality assessment and scoring
Fraud prevention and risk assessment
SMS and voice campaign optimization
Database cleaning and maintenance
Customer onboarding and verification
Marketing campaign targeting

What industries use your service?

Our customers span industries including financial services, telecommunications, marketing, healthcare, insurance, and software services, each leveraging our API to improve data quality and operational efficiency.

How do Phone Activity Scores work?

Trestle’s Phone Activity Scores range from 0 to 100. A score of 100 means consistent activity in the last 12 months, while a score of 0 means it is a disconnected number or no activity has been seen in the past 12 months. An Activity Score of 70 or above means there is high confidence that the phone is connected. An Activity Score of 30 or below means there is high confidence that the phone is disconnected or no one will answer.

How can I use the Phone Validation API?

There are a few different ways to use Phone Validation API. One way is through API integration with the help of a developer. The second way is through a bulk upload, where you upload a file, and we will send you the results.

Do you validate phone numbers globally?

Yes, we can validate phone numbers globally and provide carrier, line type, and phone activity score across 200+ countries and territories.

What information does the Phone Validator API provide?

Our Phone Validator API provides extensive information including:

Phone Activity Score (0-100)
Phone number validity checks
Carrier identification
Seven unique line type classifications (mobile, landline, fixed VoIP, non-fixed VoIP, and more)
Prepaid status

This comprehensive data allows you to make informed decisions about how to handle each phone number based on your specific business requirements.

What's the difference between fixed and non-fixed VoIP?

Fixed VoIP numbers are typically associated with a physical address (similar to traditional landlines but using VoIP technology), while non-fixed VoIP numbers are virtual numbers that can be used from anywhere with an internet connection.

Our Phone Validator API distinguishes between these types to help you identify potentially temporary or location-independent numbers that might be higher risk for certain business cases. Fixed VoIP is often used by legitimate businesses and residences, while non-fixed VoIP is more commonly associated with temporary usage, call centers, or potentially fraudulent activities.

What are your pricing options?

We offer a pay-as-you-go model starting at $0.015 per lookup. Enterprise customers with specific needs, like volume discounts, can contact our sales team for custom pricing.

Are there any monthly fees?

No, you only pay for what you use on the self-service Wallet model.

Do you offer bulk validation?

Yes, we offer both API-based batch processing and a CSV upload option for bulk validation. This is ideal for cleaning existing databases, with results typically delivered within minutes.

What does the free trial include?

Our 14-day free trial includes full access to all features of the Phone Validator API, including the Activity Score, carrier lookup, line type detection, and prepaid status check. You’ll receive 25 free validations to test the service with your own data, but if you need more, we’re happy to help. The trial requires no credit card, and there’s no obligation to continue after the trial period ends.

Do I need a credit card for the trial?

No credit card required. Full access to all features.

1B+

Phone Numbers Tracked

1,000

QPS (up to)

99.99%

Uptime

Benefits

Trestle’s Phone Validation API provides several benefits that can be valuable for businesses and organizations. Here are some of the key advantages of our phone validation tool:

Validate International Phone Numbers

Validate phone numbers across the globe with our comprehensive international phone validation. Identify carrier details, line type, and phone activity status for both domestic and international numbers to ensure accurate and reliable phone data.

Improved Conversion Rates

Weeding out junk leads with invalid, temporary, or disconnected numbers with Phone Validation API ensures sales teams can focus on the best leads and improve conversions.

Improved Data Quality

Ensure that the phone numbers collected or stored in your systems are valid and connected. By validating phone numbers in real-time, you can detect and eliminate incorrect, disconnected, or fake numbers from your lead lists and CRM systems.

Improved Message Deliverability

Boost your delivery rates and cut unnecessary costs with Phone Validation API. Distinguish mobile numbers from landlines and VOIPs and optimize SMS routing with carrier data for optimal delivery, ensuring your messages reach the right audience.

Reduce Fraud and Fake Accounts

Protect against fraud with authoritative phone intelligence data. Phone Validation API uses real-time risk signals to detect fraud and trigger step-up authentication when needed.

Enhanced Customer Experience

Phone Validation API provides a better experience with passive authentication for legitimate users using phone metadata intelligence, while step-up authentication is only triggered when needed for suspicious sign-ups.