I installed the app but when I try to click on the call forwarding button it looks like its working but then give me an error: "forwarding not available"
I tried a battery pull just still getting the error message.
I asked theTmobile rep about the visual voice mail and she said you did not have to change the phones. I upgraded to 5.0 leak and the application was there. Right now I am using Fusion Voice Mail plus because you can listen to your messages over the web also.