Redmi 1S mobile phone (Unicom version) always prompts rejection. How to solve it?

The reason why the mobile phone can't send MMS:

1. Check whether the mobile phone supports MMS function;

2. Check whether the parameters of the mobile phone MMS are correct;

3. It is recommended to turn off the phone and test it;

4. Check whether the size of the sent MMS is controlled within 50K;

5. Check whether the MMS outbox and inbox are full;

In addition to the above simple troubleshooting, it can't be solved. You can contact the manual customer service for processing.