2) Numverify

Numverify is a comprehensive phone validation tool that verifies phone numbers, identifies carrier names, line types, and prepaid status, and detects disconnected numbers.
API Features
- Phone Activity Score: This feature indicates whether a phone number is currently connected or disconnected, providing real-time status updates.
- Carrier Identification: Numverify identifies all U.S.-based carriers, including Mobile Virtual Network Operators (MVNOs), ensuring comprehensive carrier data.
- Line Type Identification: It provides detailed information on seven unique line types, such as mobile, fixed and non-fixed VoIP, landline, premium, toll-free, and voicemail services.
Numverify Pricing
- Free Plan: Offers 100 API requests per month with no support. Includes real-time number validation, carrier and line type detection, and 256-bit HTTPS encryption.
- Basic Plan: Costs $14.99 per month or $161.99 per year. Provides 5,000 API requests, standard support, and the same features as the Free Plan.
- Professional Plan: Priced at $59.99 per month or $629.99 per year. Includes 25,000 API requests and standard support, along with all features of the Basic Plan.
- Enterprise Plan: Available for $129.99 per month or $1,325.99 per year. Offers 60,000 API requests, standard support, and all features of the Professional Plan.
- Volume Plan: Custom pricing based on request volume. Requires contacting support for a quote and includes custom support options.
3) ClearoutPhone

ClearoutPhone is a robust phone number validation service that ensures accurate and up-to-date information by identifying carrier names, line types, and detecting disconnected numbers.
API Features
- Global Reach: Supports phone number validation and lookup for 232 countries, ensuring comprehensive international coverage.
- Real-time Validation: Validates phone numbers in real-time to maintain data accuracy and reliability.
- Advanced Tools: Utilizes up-to-date international numbering plans for precise validation and carrier detection.
ClearoutPhone Pricing
- Free Plan: Offers 100 credits per month with basic validation features.
- Pay-as-you-go: Allows purchasing credits as needed, with no monthly commitment.
- Monthly Subscription: Provides a set number of credits each month, with pricing based on volume.
- Enterprise Plan: Custom pricing and features tailored to large-scale needs, requiring contact with support.
- Bulk Validation: Special rates for high-volume validation requests, available upon contacting support.
4) Plivo Verify API

Plivo Verify API is a versatile tool designed to authenticate phone numbers, ensuring they are valid and reachable, while also providing detailed information on carrier and line type.
API Features
- Two-Factor Authentication: Enhances security by sending verification codes to users' phone numbers, ensuring only authorized access.
- Number Insight: Provides detailed information about the phone number, including carrier, line type, and location, for better decision-making.
- Global Coverage: Supports phone number validation and verification in over 190 countries, ensuring comprehensive international reach.
Plivo Verify API Pricing
- Base Pricing ($0): Covers OTP verification and fraud shield costs.
- Channel Pricing (Custom): Charges are based on the communication channel (SMS, WhatsApp, or Voice) and the destination country.
- Self-service: No commitment required, standard pricing applies, and includes free basic support.
- Committed Spend Agreement: Offers guided implementation, premium support options, and discounted rates with an annual contract starting at $750 a month.
- Volume Pricing: Custom pricing available for high-volume needs; contact sales for more information.
5) Twilio Lookup API

Twilio Lookup API is a powerful tool designed to validate phone numbers, providing detailed information on carrier, line type, and caller name to enhance data accuracy and reliability.
API Features
- Phone Number Validation: Ensures that phone numbers are correctly formatted and exist, helping to maintain accurate and reliable data.
- Carrier Information: Provides detailed information about the carrier associated with a phone number, including the carrier's name, type, and country.
- Caller Name (CNAM) Lookup: Retrieves the caller's name associated with a phone number, enhancing caller ID functionality and user identification.
Twilio Lookup API Pricing
- Base Pricing: $0.05 per successful verification plus standard channel fees.
- Volume Pricing: Custom pricing available for volume-based discounts; contact sales for more information.
- Channel Fees: Additional fees apply for different verification channels like SMS, WhatsApp, Voice, Email, Push, TOTP, and Silent Network Auth.
- Global Optimization: Managed number pool, regulations compliance, localization & translation included.
- High Delivery and Conversion Rate: High volume out-of-the-box, dedicated transactional routes, carrier-approved templated messages.
What to Consider When Selecting a Trestle Phone Validation API Alternative?
- Global Coverage: Ensure the API supports phone number validation across multiple countries to maintain comprehensive international reach.
- Real-time Validation: Look for APIs that offer real-time validation to keep your data accurate and up-to-date.
- Carrier and Line Type Identification: Choose an API that provides detailed information about the carrier and line type for better decision-making.
- Security and Compliance: Opt for APIs that comply with GDPR, CCPA, and other privacy regulations, and offer robust security measures like 256-bit SSL encryption.
- Scalability and Pricing: Consider the scalability of the API and whether the pricing plans align with your usage needs, including options for high-volume requests.
Which One Should You Go With?
Each of the phone validation APIs discussed offers unique features and benefits, making any of them a solid choice for your needs. However, if you're looking for a reliable and comprehensive alternative, we recommend Abstract API. With its global coverage, real-time validation, and robust security measures, it stands out as a top contender.
Sign up with Abstract API today to experience seamless phone number validation and ensure your data remains accurate and up-to-date. Whether you're a small business or a large enterprise, Abstract API has the tools and support to meet your needs.
Frequently Asked Questions
What is the Trestle Phone Validation API?
Trestle's Phone Validation API checks phone numbers and returns metadata such as carrier name, line type, and prepaid status. It also provides a phone activity score that helps identify disconnected numbers.
What are the best alternatives to the Trestle Phone Validation API?
The guide covers five alternatives: Abstract API, Numverify, ClearoutPhone, Plivo Verify API, and Twilio Lookup API. Each validates phone numbers and returns carrier and line-type details, with differences in country coverage and pricing.
How much does a phone validation API cost?
Pricing varies widely by provider. Abstract API starts at $19/month for 1,000 requests, Numverify offers a free tier of 100 requests/month with paid plans from $14.99/month, and Twilio Lookup charges $0.05 per successful verification plus standard channel fees.
Which phone validation API offers the widest country coverage?
Among the alternatives, ClearoutPhone advertises the broadest reach at 232 countries. Abstract API and Plivo Verify each cover over 190 countries.
What should I look for in a Trestle alternative?
Look for real-time validation, accurate carrier and line-type detection, broad country coverage, and security or compliance features like GDPR and CCPA support. Pricing that matches your request volume also matters.
Which phone validation API does the guide recommend?
The guide recommends Abstract API, citing its global coverage, real-time validation, and robust security measures as the reasons it stands out.



