Phone number validation is the process of verifying that a given phone number is accurate, active, and properly formatted. This ensures businesses collect valid contact information from customers, reducing errors in communication and improving overall efficiency. Validating phone numbers helps prevent failed deliveries, protects against fraudulent activity, and enhances customer trust. It also streamlines processes for SMS marketing, authentication, and customer support by ensuring messages reach real users. Phone number validation is crucial for eCommerce businesses, marketing agencies, web developers, and CRM platforms that depend on reliable customer data for engagement and operations.