How does China Unicom use 3g to send a message to cancel 4g?

If you are a 2G/3G user and want to cancel the function of the 4G network, you can use the 3G network. The 2G/3G user can choose to turn off the 4G network switch in the mobile phone settings, or you can call your home phone at any time 100 10 or connect with your business office at home to turn off the 4G network. There is no SMS logout method for the time being.

Tips: The policies of 4G network functions are different, please refer to the local provincial policies.