Why can't Redmi note4 bring its own weather and use the data network?

Your mobile phone can't use traffic. Reason:

1: The mobile phone is in arrears. Or no traffic.

2. The data network is not open or the data connection is prohibited.

Solution:

1: Check whether the phone bill and traffic are turned off.

2: Turn on the data switch.

3: Open the Security Center → Network Assistant → Network Control → As shown in the figure.