Phone APIs

Phone number validation and lookup

5 APIs in this category · last checked 2 October 2026

APIs listed

need no API key (20%)

CORS enabled (40%)

HTTPS (100%)

This directory lists 5 phone APIs. Use the filters below to narrow by authentication, HTTPS support and CORS. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.

Showing 5 of 5 APIs

Abstract Phone Validation

Validates phone numbers in over 190 countries and returns carrier, line type, and country data. Free plan includes 100 requests with no credit card required.

Auth: apiKey HTTPS CORS: Unknown

Veriphone

Validates phone numbers against official numbering plans in 243 countries and returns carrier and line type. Free plan includes 1,000 validations per month.

Auth: apiKey HTTPS CORS: Unknown

apilayer numverify

Validates phone numbers and returns carrier, line type, and location across 232 countries. Free plan allows 100 requests per month with HTTPS on all plans.

Auth: apiKey HTTPS CORS: Yes

Cloudmersive Validate

Parses and validates international phone numbers, returning a standardized format, phone type, and location. Free plan includes 600 calls per month with no expiration.

Auth: apiKey HTTPS CORS: Yes

Phone Specification

Open source REST API scraping phone specifications and brand data from GSMarena, including search and trending models. No authentication required, but v1 may be retired soon.

Auth: No HTTPS CORS: Unknown

API	Description	Auth	HTTPS	CORS
Abstract Phone Validation	Validates phone numbers in over 190 countries and returns carrier, line type, and country data. Free plan includes 100 requests with no credit card required.	apiKey	✓	?
Veriphone	Validates phone numbers against official numbering plans in 243 countries and returns carrier and line type. Free plan includes 1,000 validations per month.	apiKey	✓	?
apilayer numverify	Validates phone numbers and returns carrier, line type, and location across 232 countries. Free plan allows 100 requests per month with HTTPS on all plans.	apiKey	✓	✓
Cloudmersive Validate	Parses and validates international phone numbers, returning a standardized format, phone type, and location. Free plan includes 600 calls per month with no expiration.	apiKey	✓	✓
Phone Specification	Open source REST API scraping phone specifications and brand data from GSMarena, including search and trending models. No authentication required, but v1 may be retired soon.	No	✓	?

Best Phone APIs for Developers

A phone API allows developers to validate phone numbers, perform carrier lookups, send SMS messages, and integrate voice calling into their applications without managing telecom infrastructure. These APIs are essential for OTP verification, notifications, and user authentication.

Five of these APIs validate phone numbers while one covers device specifications, a different need entirely. Veriphone and apilayer numverify are the most established for validation, covering over 230 countries with generous free monthly quotas and no credit card required to start. Abstract Phone Validation adds fraud and risk scoring but limits free use to 100 requests at 3 per second.

Cloudmersive Validate suits teams already using its platform for other checks since validation is bundled with its wider REST API. Watch data freshness here: carrier records change constantly as numbers get ported between networks, so free tiers lag behind paid ones. For hardware data instead of number checks, Phone Specification scrapes GSMarena listings and needs no key at all, though its original endpoint is being retired in favor of v2.

What to check before you pick one

E.164 format support: Ensure the API accepts and normalizes numbers in E.164 international format for consistent storage and processing.
Line type detection: Distinguishing mobile from landline numbers is important for SMS campaigns, as landlines cannot receive text messages.
Delivery receipts: SMS APIs with delivery webhooks let you confirm whether messages were actually received by the handset.

Frequently Asked Questions

What are phone APIs?

Phone APIs provide services for validating phone number formats, performing carrier lookups, detecting line types (mobile vs. landline), sending SMS messages, and making programmatic voice calls.

Is there a free phone number validation API?

Abstract API and NumVerify both offer free phone validation tiers. They validate number format, determine country and carrier, and check whether the number appears active.

How do I send SMS using an API?

Twilio and Vonage (formerly Nexmo) are the most popular SMS APIs. Both require account creation and provide free trial credits. Send a POST request with the recipient number and message body to their REST endpoints.

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