Samsung mobile phone shows that downloading attachments from MMS failed when it is turned on.

1. Turn on the data switch of the mobile phone (pull down the top curtain and light up the data/enter the mobile phone settings - wireless and network - mobile network - use data packets to check)

2. Open the mobile phone settings -More-Mobile Network-Access Point Name-Menu-Reset to Default Settings

3. After successful setting, choose to send a new MMS (the previous MMS may not work properly due to network or time issues) Receive)

4. Try changing other SIM cards

5. If you cannot send and receive MMS messages normally, please back up your phone data (phone book, messages, multimedia files, etc.) and restore your phone to its original factory. Settings-Privacy-Restore original settings). If the problem still cannot be solved, you need to send the phone to the nearest service center for testing.