Switch the main card and the auxiliary card to stop.

What you want to ask is the reason why the mobile phone stops running when it switches between the main card and the auxiliary card. The main card is in arrears.

The reason why the mobile phone switches between the main card and the auxiliary card is because the main card and the auxiliary card must be shut down after the deadline, that is, after the main card is shut down due to arrears, the auxiliary card will also be shut down due to arrears and cannot be used again. You need to go to the business hall to find out the reason for stopping using it and resume using it according to the staff's prompt.

Downtime refers to the suspension of mobile phone service, and users can't use all services such as telephone, SMS and Internet. There are generally two kinds of downtime. One is that the user actively applies to the operator to suspend the mobile phone service by reporting the loss or stopping the phone number.