Why does my mobile phone always display a short message in the upper right corner?

Has the landlord installed any software with the function of intercepting incoming calls and short messages, such as 360? If you open the software, you can see it This software will intercept incoming calls and text messages from junk or strange numbers, and the corresponding intercepted text messages will be displayed at the top right of the screen. If it is not a big problem, don't break it easily.