Access up-to-date phone carrier information and eliminate disconnected phones with Phone Validation API.

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Is Valid

Analyzes the number syntax and whether it is a valid US or CA number.

is_valid: Ready...

Activity Score

Indicates whether the phone is connected or disconnected, and returns a 1–100 rating for phone activity volume.

activity_score: Ready...

Line Type

Identifies line type of the phone behind the number.

line_type: Ready...


Identifies the carrier of the phone line behind the number.

carrier: Ready...


Identifies the country code and country name associated with the number.

country_name: Ready...

Is Prepaid

Indicates whether the number is a prepaid line.

is_prepaid: Ready...

Phone Validation API

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. 

  • id: "Phone.3dbb6fef-a2df-4b08-cfe3-bc7128b6f5b4",
  • phone_number: "2069735100",
  • is_valid: true,
  • activity_score: 57,
  • country_calling_code: "1",
  • country_code: "US",
  • country_name: "United States",
  • line_type: "NonFixedVOIP",
  • carrier: "Level 3 Communications, LLC",
  • is_prepaid: false

Unlock Powerful Use Cases with Phone Validation API

Lead Contactability and Prioritization

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

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.


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.


Identifies all US-based carriers 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.


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:

  • Improved Conversion Rates

    Weeding out junk leads with invalid, disconnected, or temporary numbers with Trestle’s Phone Validation API ensures that 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

    Increase delivery rates and cut costs with phone validation. With Trestle’s Phone Validation API, you can distinguish mobile numbers from landlines and VOIPs and optimize SMS routing with carrier data for optimal delivery.

  • 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 allows you to provide 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.

Why Trestle?