Free phone validation tool is a key component to maintaining clean user databases and improving the quality of your SMS and voice call conversion rates. It prevents wasting your team’s time by calling or texting non-functional phone numbers and allows you to optimize your marketing efforts by only reaching active leads and customers.

There are numerous free and paid solutions for validating phone numbers. Some are very simple and limited, while others provide a full suite of features to ensure your contact database is accurate and up to date. Here are a few of the best options available:

ClearoutPhone

ClearoutPhone is an easy-to-use tool for determining whether a phone number is valid and in service. It offers a wide range of features including verification, carrier identification, and line type classification. It also checks if the number is prepaid and provides portability information. Its free trial enables you to test out the tool with 100 credits.

Numlookup

Numlookup is a phone validation solution that offers a free tier of 100 API requests for the month, which is sufficient for simple use cases. It uses real-time carrier data to check if a phone number is active and identifies the country of origin.

SMS Connexion

SMS Connexion provides a powerful phone validation API that is compatible with all popular programming languages. It supports international coverage and allows you to identify a number’s country, network operator, and line type (landline, mobile/cellular, or VOIP). The API also performs deep pings directly with carriers to verify connectivity and identify disconnected or terminated numbers. It also analyzes and scores a phone number based on its reputation across IPQS’ threat network to identify known fraudsters.