How to solve the failure of downloading MMS?

The solutions to the failure of downloading MMS are as follows:

Tools: Huawei mate4pro mobile phone, HarmonyOS OS3. and mobile phone settings.

1. Let's turn on the settings on our mobile phone first.

2. Click once to enter the settings.

3. Click to enter the mobile network page.

4. Click to move the data.

5. finally, we just need to turn on the switch in the mobile data.