The steps are as follows:

Open Master Wang's app and click My-Account Management-Security Service-Unbind Mobile Phone, and then rebind the mobile phone number in Security Service.

master Wang APP is specially designed for on-site service providers and engineers. Engineers can use master Wang APP to take orders, make APPointments, feedback service progress, promote services and extend warranty, and service providers can use master Wang app to take orders, make appointments, dispatch workers and check service progress. Master Wang APP is designed for service providers and engineers who provide on-site services. Engineers can use Master Wang APP to take orders, make appointments, give feedback on service progress, promote services and extend warranty. Service providers can use Master Wang APP to take orders, make appointments, dispatch workers and check service progress.