Recently I received multiple popups that looks like this:
The popup has a high priority since I can't do any other thing when the popup is displayed. It also doesn't appear in the notification. When I click "Cancel", the popup disappears immediately.
I'm running Android Oreo 8.1 with the latest security patch. The message looks like an advertisement sent from the operator. I've tried to disable all emergency alert (from Wireless alerts menu in Google's SMS application setting), but the message still appears.
I would like to know what kind of popup is this (doesn't look like from an app) and what would have triggered it.