Phone Validation API

Phone Validation API

Phone Validation API validates phone numbers and provides phone metadata, including carrier, line type, prepaid status, and a phone activity score to identify disconnected numbers.

Phone Validation API validates the phone number and provides phone metadata, such as carrier name, line type (landline, mobile, non-fixed VoIP, etc.), is the phone prepaid, and includes a phone activity score to help identify disconnected phone numbers. Typical use cases for this phone validation API includes lead contactability and prioritization. 

API Documentation


Phone Validation API validates phone numbers and provides phone metadata, including carrier, line type, prepaid status, and a phone activity score to identify disconnected numbers.


Phone Validation API - Endpoint Features
Object Description
phone [Required] Phone number to query
Test Endpoint


"id": "Phone.f6aa35da-0860-4122-9ab7-94d3409ac2d2",
"phone_number": "+17128475109",
"is_valid": true,
"activity_score": 30,
"country_calling_code": "1",
"country_code": "US",
"country_name": "United States",
"line_type": "Unknown",
"carrier": "Fibernetics - SVR",
"is_prepaid": false,
"error": null,
"warnings": []

Phone Validation API - CODE SNIPPETS

curl --location --request GET '' --header 'Authorization: Bearer YOUR_API_KEY' 


API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Phone Validation API REST API, simply include your bearer token in the Authorization header.


Header Description
Authorization [Required] Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

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The following checks are performed by Trestle's Phone Validation API: (1) Syntax Checks (2) Is the number assigned to a carrier? (3) Is the number connected or Disconnected? In addition, the API also provides country code, line typ (Landline, Mobile, Fixed and Non-fixed VoIP, Tollfree, etc.) and whether the phone is prepaid or not.

Trestle's Phone Validation API is an Enterprise API serving Fortune 100 companies to SMBs. Our p95 latencies (95% of queries) are less than 500 mSec, serving customers doing queries from 1 QPS (1 query per second) to up to 750 QPS. Our availability is 99.99%. More details on our latencies can be found here: Our SLAs can be found here:

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, assigned to a subscriber, and someone has been placing calls consistently. An activity score of 30 or below means there is high confidence that the phone is either disconnected, or no one will answer the call when the number is dialed. An activity score of 50 means Trestle doesn’t have enough signals to predict whether the phone is connected or disconnected and inactive.

Trestle's Phone Validation API documentation can be found here: Other Product details can be found here:

The maximum QPS supported by this integration, is 10.

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