What I want to set is: you can only use the traffic of 1, and you are forbidden to use the traffic of No.2 card, and you can make phone calls and send text messages normally.

Hello, you can set it, as shown below (mine is a Huawei mobile phone): Settings in the mobile phone-> Wireless and network->; Dual-card management: Select which card to take for default mobile data (that is, traffic), and then set the default dial card (that is, call and send text messages). The menu settings of different mobile phones may be a little different, but the dual-card settings of Android system are not much different. I hope I can help you!