No, never was able to get it added to my GV account.

As far as tech support for GV, there really is none for Google. Just the forums and no response there.

As far as tech support @ Truphone, they responded with the typical boilerplate of "we are not necessarily compatible with all VoIP providers, blah blah blah".

I realize it isn't truphone's issue to fix, but it is frustrating. Every time I try it, the phone with the TruPhone SIM rings for less than a second during the GV confirmation call and I can never answer it fast enough.