Home - Next Caller, Next Caller delivers enterprise-grade Call Verification and Fraud Prevention services through a state-of-the-art API, VeriCall®. VeriCall® improves the authentication process by instantly giving the green light to real customers and flagging suspicious calls to stop phone fraud before it starts. With Next Caller, businesses save time, money, and avoid treating customers like criminals—all without compromising security. VeriCall® has analyzed hundreds of millions of calls to date and leverages ma.