GV Mobile will not experience any hiccups with the new changes Google has implemented. This only applies to applications using the DTMF method (dialing your GV # to make calls). Unfortunately, apps like GVDialer will cease to work unless they change the way they place calls.
The impact this does have to GV Mobile is the removal of an upcoming feature, ‘Offline Dialing’ which used this method. Apple prevents developers from sending a * or # sign to the iPhone dialer – so there is no way to dial your GV # and send the * required to enter in your PIN. Android, Blackberry, and Windows Mobile phone OS’s do not limit the developers this way. Hmmm 😉