How to close one of the two cards of oppo mobile phone?

If your OPPO phone supports dual card dual standby, you can insert two mobile phone cards at the same time. The first card slot is a Nano SIM card, and the second card slot is a variable card slot. You can choose one of the Nano SIM card and the memory card to insert, and you can choose how to use each number in the mobile phone.

1, ColorOS 7 and above: "Settings >; Mobile network (SIM card and traffic management) Click Default Internet Access or Default Dial to select the number to use.

2.ColorOS 6 version: "Settings >; Dual-card mobile network "Click on the Internet or dial to select the number to use.

Tips:

Enable or disable the SIM card: Settings > Mobile Network (SIM Card and Traffic Management), select the SIM card to be enabled or disabled, and then turn on or off the Enable switch.