Why can't Huawei Glory 7A mobile phone send MMS?

Glory Play 7A MMS failed to be sent, which may be due to poor network conditions or poor signal. Please check the network status or signal, make sure the connection is normal, and then try again. The recipient number information is not filled in correctly. Please correct and resend the MMS. The edited MMS exceeds the upper limit of 300KB set by the operator. Please delete some content and try sending again. Mobile phone arrears. Please pay the fee and try again. There is not enough memory in the mobile phone to receive it. Please free some memory to make the remaining space more than 300K K. When the data service is turned off, MMS cannot be sent. Solution: EMUI 8.0: settings > wireless and network > mobile network > mobile data, and turn on the mobile data switch. At the same time, it is recommended that you try the following:

1. Check the APN settings of the mobile phone to make sure that the mobile phone has the correct APN for MMS. Check the path: please go to EMUI8.0: Settings > Wireless and Network > Mobile Network, select the access point name (APN) of the SIM card to be checked, then select "Reset to Default" and try to send MMS normally;

2. If the APN code is correct, please turn off Wi-Fi to see if it can be sent normally;

3. If it still can't be sent normally, please put the SIM card on other mobile phones to see if you can send MMS normally;

4. If it still can't be sent normally, please back up important data, restore factory settings and try again.