Xiaomi mix can't recognize the SIM card. What should I do if I can't surf the Internet?

Xiaomi's mobile phone can't surf the Internet. Solution:

1, restart the phone;

2. Drag down from the top of the screen (or from bottom to top) to ensure that Mobile Data is turned on and WLAN is turned off;

3. Enter the mobile phone settings-mobile network (or dual-card mobile network)-select the card name that needs to access the Internet, keep the card slot that needs to be used open, click the name of the access point (APN)- click the menu button "Reset to default settings" (whether the traffic fee generated by the cmnet access point is included in the package is subject to the actual opening of the package);

4. After setting, you still can't access the Internet. It is recommended to change the machine and card for testing.