I've received a warning message on my phone's home page and I can't get it to go off.

[AC Question]

Here is the message that is in the middle of my home page, and doesn't disappear if I try to type message. "Warning. You only have to install a Great App to get your phone fully functioned." Then it has the word "Confirm" and in the bottom right corner the word Delivered.

Does anyone know if this is a malicious message, if I should "confirm" it, or how to get rid of it permanently. I tried shutting off the phone but it came back when it rebooted.

 

[belodion]

It is scareware. Do not be deceived.
Try booting into Safe Mode, to test whether it originates in a third-party app.
Let us know what happens.