I sent a text to my sister that said ???? and ever since, every time i return to 1 of the home screens from any application, mail, etc, ???? comes up at the bottom of the screen in black, then eventually fades away. What the ??? I assume it has something to do with the text i sent, it can't be just a coincidence that it's 4 ? marks too. Never seen anything like it on this phone, had it for about 4 months.