Dont know if you can change this in the phone's parent object or not, if you could this would be a simple fix.
IF not, this could be daunting....
My reason is that myself, and others i'm sure are still in the habit of calling them cell phones. . . I dont have a problem with it since their called Progia-# Cell. But I've noted some players/admin have expressed that they are not cells they are gridphones...
So i thought that might help keep the theme goin.