→ What's wrong with Xiaomi's mobile phone not receiving MMS?

First, let's make sure that your data streaming function is turned on. Then, check the system settings-Mobile Network-Turn on Always Accept MMS. In addition, Xiaomi has its own firewall. You need to make the following settings: Open System Tools-Traffic Monitoring-Firewall, and click Open. In addition, turn everything below 2G/3G into a green tick. In addition, if everyone's mobile phone is equipped with other software similar to 360 Mobile Guardian, because they also have a firewall, they should open it and complete the same settings as above. Bian Xiao suggested that you can turn off the firewall of those softwares, because Xiaomi's own works well. If you install too much software, it will also occupy the memory of your mobile phone.