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Mobile phone number, how to switch between primary and secondary numbers with one card and two numbers?

It can be operated in the following two ways:

1. Soft switching: Select the "Select Number" option in the "One Card with Double Numbers" menu of STK to switch the primary and secondary numbers without turning off the phone.

2. Hard switching: When switching the primary and secondary numbers, turn it off and then on, and then input the PIN code corresponding to the required switching number to switch the numbers (the initial PIN code for No.1 is "12340 1" and the initial PIN code for No.2 is "123402").