Redmi 1s cannot send or receive MMS.

1. First check whether the mobile phone can send and receive short messages normally. If not, check whether the signal coverage around the mobile phone card and mobile phone is normal, and check whether the number of the SMS center is correct. You can try another card, or try another place with a signal.

2. If you can send and receive SMS normally, it may be that the mobile phone is connected to the data network and cannot send and receive MMS, because MMS can only be sent successfully if it has the function of "surfing the Internet by mobile phone", but there will be no traffic charge, and the operator will charge according to the number of SMS.

3. Check whether the mobile phone has turned on the option of always receiving MMS, and go to Settings-Mobile Network-Always Receiving MMS.

4. Check whether the attached multimedia message is too large. Operators generally have strict size restrictions on the pictures sent by MMS. Please consult the operator for details.

5. It may also be a system problem that makes it impossible to send and receive MMS normally. You can try restarting your phone. If not, consider resetting or upgrading the system to the latest version.

6. If the above methods can't be solved, it may be caused by the hardware problem of the mobile phone. It is recommended to contact Xiaomi to test and repair the mobile phone after sale.