Can Xiaomi mobile phones with dual systems receive messages?

Yes.

Xiaomi mobile phones can receive messages after activating dual systems. You will receive a notification in the notification bar. Click in and you can switch to another system at will.

Dual system of Xiaomi mobile phone is a brand new feature launched after the system upgrade of Xiaomi mobile phone. It allows one mobile phone to run two systems at the same time, which is equivalent to one mobile phone becoming two systems. Cell phone only.