What is a Phone Number Validation API?

A phone number validation API checks whether a phone number is valid, active, correctly formatted according to international E.164 standards, and returns carrier network and line type details (Mobile, Landline, VoIP).

Is ProWebLook phone validation free?

Yes! You can check phone numbers online for free or sign up for a free developer API key with complimentary request credits.

How many countries are supported?

ProWebLook supports global phone number validation across 180+ countries with sub-200ms latency.

Phone Number Intelligence

Validate Any Phone
Number Worldwide

Instantly check whether any phone number is mobile, landline, or VoIP. Get carrier info, country, region, and line type via our simple REST API. Need caller name delivery? Try our Caller ID API.

195+

Countries

99.9%

Uptime

<100ms

Response Time

Phone Validation API

Mobile · Landline · VoIP Detection

            {

              "status": "VALID_CONFIRMED",

              "formatted_number": "+1 415 555 2671",

              "countryname": "United States",

              "linetype": "Mobile",

              "carrier": "T-Mobile",

              "location": "California"

            }

Free Phone Number Checker

Enter any phone number with country code to get instant validation results

195+ Countries

Mobile/Landline/VoIP

Carrier Detection

Free to Try

Features

Everything You Need to Know About a Number

Our phone validation API delivers comprehensive data — from basic validity to carrier, line type, and geographic information.

Real-time Validation

Instantly verify any phone number is valid, callable, and properly formatted according to E.164 international standards.

Line Type Detection

Accurately classify numbers as mobile, landline, VoIP, toll-free, premium rate, or pager across all 195+ countries.

Carrier Identification

Identify the mobile network operator (MNO) or telecom carrier responsible for the phone number you're validating.

Geographic Data

Get the country, region/city of origin, and international dialing format for any phone number worldwide.

Easy Integration

Simple JSON REST API that integrates with any language or platform in minutes. WordPress plugin also available.

Continuously Updated

Our phone database is updated weekly and monthly with new carrier data, area codes, and number range assignments.

API Integration

Integrate in Minutes

Simple JSON API with clean endpoints. Full docs at our developer portal.

WordPress Plugin Available

Our ProWebLook Phone Validator WordPress plugin harnesses the power of our API to validate phone numbers directly in your WordPress forms. Easily integrated within any CRM or CMS with basic programming experience.

WordPress Plugin API Docs

Powerful & Scalable

From a thousand requests a month to several million a day — our scalable cloud infrastructure has got you covered at any stage of growth. 99.9% uptime SLA, globally distributed.

Get Started Free

Flexible Pricing Model

We offer subscription pricing models starting with a free account. You can pay through PayPal or Credit Card, or start with 10 free credits — no credit card required. Cancel anytime.

Create Your Account

Pricing

Flexible & Competitive Plans

Choose how you pay, pick your credit tier, and checkout with live Stripe or PayPal links.

Billing

Step 1 of 2

Usage

Step 2 of 2

— credits

Testimonials

Trusted by Thousands of Developers

"Phone Number Checker is a simple yet powerful API that takes a phone number and returns whether or not it is valid, as well as carrier and type. These checks save us hours every week."

Peter Szulczewski

CEO, Wish

"Tapping into ProWebLook has had a big impact on our business and customers. The delivery rate, accuracy and ease of integration can't be compared to other channels."

Wahyu Saputra

Head of Product

"WorldRemit needed reliable phone validation for our money transfer flows. ProWebLook delivers instant, accurate results across all 195+ countries we operate in."

Alice Newton-Rex

CPO, WorldRemit

"The API opens a quick and easy way to validate our customers' contact numbers. It's aligned with our customer-centric strategy and provides excellent accuracy."

José M. Dalmau

VP Business Development

FAQ

Frequently Asked Questions

The Phone Number Checker API validates whether a phone number is valid, along with additional details such as country, region, carrier, line type (mobile/landline/VoIP), and properly formatted international number. If you also need caller name delivery (CNAM), try our Caller ID API.

The API supports phone numbers from 195+ countries and territories worldwide — from Afghanistan to Zimbabwe. Every country with international phone number standards (E.164) is fully supported.

To ensure extensive coverage in every country and line type, we use multiple databases that are regularly ingested and cross-referenced. Numerous updates are made daily, with substantive updates to the phone data collection made weekly and monthly.

ProWebLook Phone API is built on a highly scalable cloud infrastructure capable of handling anything from a thousand phone lookups per month all the way up to several million API requests per hour — with no performance degradation.

Yes! You can cancel your subscription at any time with no penalties or cancellation fees. Your access will remain active until the end of the current billing period.

For Developers

Phone Number Validation API

Programmatically validate phone numbers worldwide via our REST API.

API Quick Reference

Endpoint	`GET / POST` `https://lookup.proweblook.com/api/v1/phonevalidation`
Authentication	GET: send `api_key` in the query string. POST: send `api_key` in a JSON or form body.
Phone number	`phone_number` is required. Without `country_code`, send a full international number containing the country calling code, preferably E.164 (for example, `+14155552671`). URL-encode the leading `+` as `%2B` in GET URLs.
Country hint	`country_code` is optional. A local or national number requires a two-letter ISO 3166-1 alpha-2 hint, for example `phone_number=9876543210&country_code=IN`. This parameter is `IN`, not the numeric calling prefix `+91`. Omission or `none` enables detection from a full international number.
Result	JSON with `status: VALID_CONFIRMED` or `status: INVALID`. An invalid number is a completed validation result, not an API error.
Cost	1 phone validation credit from your `phone` credit pool per successful validation.

# Full international number; no country_code needed
curl "https://lookup.proweblook.com/api/v1/phonevalidation?api_key=YOUR_API_KEY&phone_number=%2B14155552671"

# Local/national number; country_code is required
curl "https://lookup.proweblook.com/api/v1/phonevalidation?api_key=YOUR_API_KEY&phone_number=9876543210&country_code=IN"

curl -X POST "https://lookup.proweblook.com/api/v1/phonevalidation" \
  -H "Content-Type: application/json" \
  -d '{
    "phone_number": "+14155552671",
    "api_key": "YOUR_API_KEY"
  }'

const response = await fetch('https://lookup.proweblook.com/api/v1/phonevalidation?api_key=YOUR_API_KEY&phone_number=%2B14155552671');
const data = await response.json();
console.log(data);

import requests

url = "https://lookup.proweblook.com/api/v1/phonevalidation"
params = {"api_key": "YOUR_API_KEY", "phone_number": "+14155552671"}
response = requests.get(url, params=params)
print(response.json())

<?php
$url = "https://lookup.proweblook.com/api/v1/phonevalidation?api_key=YOUR_API_KEY&phone_number=%2B14155552671";
$response = file_get_contents($url);
echo $response;
?>

Response fields

Only status is guaranteed for every completed validation. Enrichment fields can be absent when status is INVALID.

Field	Type	Description
`status`	string	`VALID_CONFIRMED` or `INVALID`
`formatted_number`	string	Internationally formatted phone number
`linetype`	string	Mobile, Fixed Line, Fixed Line or Mobile, Toll-Free, Premium Rate, Shared Cost, VoIP, Personal Number, Pager, Universal Access Number, Voicemail, or Unknown
`carrier`	string	Carrier/operator name; it may be empty for a landline
`location`	string	City, region, or country description
`countrycodenum`	integer	Numeric country calling code, such as 1, 44, or 91
`countrycode`	string	ISO 3166-1 alpha-2 country code
`countryname`	string	Full country name
`formatnational`	string	National display format
`formatinternational`	string	International display format
`timezone`	array	Applicable IANA timezone strings
`ratelimit_remain`	integer	Calls remaining in the current rate-limit window
`ratelimit_seconds`	integer	Seconds until the rate-limit window resets

Valid and invalid results

{
  "status": "VALID_CONFIRMED",
  "formatted_number": "+1 415 555 2671",
  "linetype": "Mobile",
  "carrier": "T-Mobile",
  "location": "California",
  "countrycodenum": 1,
  "countrycode": "US",
  "countryname": "United States",
  "formatnational": "(415) 555-2671",
  "formatinternational": "+1 415 555 2671",
  "timezone": ["America/Los_Angeles"],
  "ratelimit_remain": 100,
  "ratelimit_seconds": 100
}

{
  "status": "INVALID"
}

API errors

HTTP	Meaning
`400`	Required parameter missing or invalid
`401`	API key missing or invalid
`402`	Insufficient phone credits
`500`	Unexpected server error

Error responses contain an error string, for example {"error":"Invalid API key."}

Read the official API reference

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Validate Any Phone
Number Worldwide

Free Phone Number Checker

Everything You Need to Know About a Number

Real-time Validation

Line Type Detection

Carrier Identification

Geographic Data

Easy Integration

Continuously Updated

Integrate in Minutes

WordPress Plugin Available

Powerful & Scalable

Flexible Pricing Model

Flexible & Competitive Plans

Billing

Usage

Dedicated pricing is being prepared

Trusted by Thousands of Developers

Frequently Asked Questions

What does the Phone Number Checker API verify?

In which countries does the phone number verification work?

How often is the phone database updated?

How scalable is the phone validation service?

Can I cancel my subscription anytime?

Phone Number Validation API

API Quick Reference

Response fields

Valid and invalid results

API errors

Get FREE Credits to Start Today

Validate Any PhoneNumber Worldwide

Free Phone Number Checker

Everything You Need to Know About a Number

Real-time Validation

Line Type Detection

Carrier Identification

Geographic Data

Easy Integration

Continuously Updated

Integrate in Minutes

WordPress Plugin Available

Powerful & Scalable

Flexible Pricing Model

Flexible & Competitive Plans

Billing

Usage

Dedicated pricing is being prepared

Trusted by Thousands of Developers

Frequently Asked Questions

What does the Phone Number Checker API verify?

In which countries does the phone number verification work?

How often is the phone database updated?

How scalable is the phone validation service?

Can I cancel my subscription anytime?

Phone Number Validation API

API Quick Reference

Response fields

Valid and invalid results

API errors

Get FREE Credits to Start Today

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Validate Any Phone
Number Worldwide