i go to Settings -> Phone -> In the Forward to entry box. I enter my google voice number as +1googlevoice# then when i click the "Save" button the phone thinks for a few seconds and then i get the "Invalid Number" popup. I've tried entering the number with the physical qwerty keyboard and the touch screen keyboard. The number is the correct GV number and gv account does work as i've used it before to receive calls. Could it possibly have something to do with the tmobile plan i'm on, "Even More Plus 500"? Any thoughts?