Why is the short message received by the mobile phone a short message pattern with a question mark in the middle?

Do you confirm whether the message sent by the other party is MMS or SMS? If it is MMS, it is likely that your mobile phone does not support the transmission format.

If it is a short message, there are many mobile phones that can add some symbols and icons to the short message, but your mobile phone has nothing corresponding to it and cannot be displayed.

You can try to forward this message to someone else's mobile phone and see if it can be displayed.