Greetings

I have a question for the hackers out there.....

I have a jailbroken IP4. One of the nice add-ons you can get is to replace the AT&T logo with some nice graphics like the AT&T death star . This works great BUT at home I have an AT&T microcell which puts it own logo up. Does anyone know the location of the graphic file (directory, naming convention) and the size requirements if I were to make my own graphic for the microcell??