Thank you for the warning about that 30 days stuff, but I am very new to all this android phone stuff and would like to ask about the triangle boxes. I get it about that message the OP showing in that image being a scam, but the triangle boxes themselves are of interest in this post.
Whether a message is a scam or real, does that triangle box thingy up there show itself? I mean, just when exactly does that triangle box show up there?
You see, I was given an android phone by my family last year just before checking into the hospital for what everyone knew would be a lengthy stay and we needed a new communications device, so I am quite new to all this android stuff. Never paid the tool any mind before last year.
So what's the deal with those triangle thingies? When do they appear? Just a rough summary is fine, thank you. Or a link to an excellent paper that covers that, would be much appreciated.