You have it backwards. You don't forward your work number to GV, you answer your GV number at work. It, in essence, becomes your every number. The purpose of the jb GV Mobile app is so that you can use it for both incoming and outgoing, and your callers will dial your GV number no matter where you answer it, and when you call them, they'll see your GV number on their caller id, no matter what phone (number) you call them from.