If you have to show more than 4 digits, and need to get out of a bind, and do not mind an Android 2.0 theme , then set the target SDK in the manifest editir to 10. You will get 8 or 9 digits.
I know
@Erel is going to chew me up for answering you this way as he advises against older themes, but sometimes, you got to do what you have to do.