Dual card dual standby, how to choose which card to use when sending text messages?

If you use a vivo phone, you can go to Settings-Dual Card and Mobile Network-Dialing and Information-Default Information Card-Select Mobile/Unicom/Telecom.

Open the interface of Huawei p7 mobile phone, find the information icon on the desktop of Huawei p7 mobile phone, and click Enter, as shown in the figure below. After entering the information interface of Huawei p7 mobile phone, click+in the lower right corner to add a new message, as shown in the figure below. After editing the message, click the icon on the left side of the text bar to select the mobile phone card, as shown in the figure below.

If you use OPPO mobile phone (ColorOS system) to send short messages, go to Info APP > > click "+"> enter recipient's name in the upper right corner/lower right corner, and edit the contents of the short message box to send.

Open the phone information page. Select the object to send. Enter the contents in the options. Click the mobile phone card icon in front of the content box. In the number that pops up, select one and click Send.

The method of calling card 1 and card 2 on Apple mobile phone is as follows: Operating device: iPhone 13. Device system: iOS 10. Operating software: mobile phone dialing. First, in the dial key interface of the mobile phone, click the main number option above. As shown in the figure. Then in the small box that pops up, find the major number or minor number you want to use, and click.