Verify Phone Numbers Entered with Voice Call or Text Message

DOTS Telephone Verification

A real-time web service API that validates a phone number by sending a confirmation code by voice or text message.

This service is ideal for companies that want active verification of a phone number. DOTS Telephone Verification allows businesses to authenticate customers’ phone numbers to verify that the entered telephone number is working, and in their possession.

How it Works

Telephone Verification

Sample Request URL

XML output using query string parameters:[YourKey]
Four ways to use our services

Integrate any of our easy-to-program contact verification APIs directly into your systems for real-time cleansing, appending and fraud protection.


When you have a quick list that needs to be verified and cleansed, it's time for DataTumbler, our PC-based data cleansing application.


Implementing an automated FTP batch for your data quality needs is the perfect way to cleanse data from one of your systems on a scheduled time of day or month.


Our Quick Lookups are the perfect way to get the job done fast! Access-from-anywhere data validation tools will come in handy for quick contact lookups.

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Get expert help and answers from your personal support engineer. Take advantage of our dedicated test environment.

Plans start as low as $289 per month
    • Places a call and recites a verification code or sends a text message containing the code in real-time (message and data rates may apply)
    • Supports over 100 concurrent calls with virtually no drop in performance
    • US and Canadian phone numbers supported
    • Transactional detail report returns advanced call analytics
    • Places calls within five seconds and will auto redial up to three times if busy or no answer
    • Real-time API service
    • Helps prevent possible fraudulent transactions at point-of-entry
    • Eliminate fraudulent orders before you ship and reduce chargebacks
    • Validates customers phone number in real-time
    • Reduce administrative costs by eliminating manual verification of orders and online registrations