How to set up one plus three mobile phone dual cards?

The method of adding dual-card settings to a mobile phone is as follows: enter the settings of mobile phone -SIM card and mobile network, and set the default card for dialing, texting and surfing the Internet: 1. Dialing: click the default calling card and select /SIM card1/simcard 2 as needed; 2. Send SMS: Click the default SMS card and select /SIM card 1/SIM card 2 as needed; 3. surfing the internet: click the default flow card and select /SIM card1/simcard 2 as needed.