Is it free to make phone calls with nailing software?

Nail is the latest team communication software released by Alibaba, which leads the new trend of efficient communication, supports multi-party calls, sends messages in the form of free phone calls or text messages, and supports single chat and group chat. The mobile network and telecom network are seamlessly connected to realize free calls. No matter whether it is point-to-point or multi-party calls, once they are converted into voice calls, including multi-party conference calls, they take the telecom network instead of the mobile data network. Cleverly avoided the hostility and opposition of operators.