Never seen it before. The dot at top right, next to signal strngth. It has a short horizontal bar through it? It goes away when I pull down, comes back when I release the notifier shade. Useless I think - it should say what it wants.
More general - one problem with ALL phone OSs is there are no definitive documents on them showing everything they can do. That I'm aware of. I googled for this and nada.
More general - one problem with ALL phone OSs is there are no definitive documents on them showing everything they can do. That I'm aware of. I googled for this and nada.