One thing that comes to mind, if a call comes in accompanied by screen message of a kind that I have never seen before I'd be twice as alarmed as with just some

One thing that comes to mind, if a call comes in accompanied by screen message of a kind that I have never seen before I'd be twice as alarmed as with just some random unknown number calling. I might end up googling recently updated apps for news of a malware takeover instead of answering the call. But it would be a good idea nonetheless, it only requires to be accompanied by a serious information campaign preparing first time receivers for the surprise.