Did a search and didn't find a dedicated thread for this, so I thought I'd write one. I recently learned that Groove IP is shutting down d/t a change Google is making to their Voice. It appears that the change is going to disable pretty much all other similar voip apps. I figured this would impact T-Mobile $30/mo plan VOIP users the most, so I wanted to give you a headsup. You can read more about it here
It's a sad ending to a great setup, but all good things come to an end.
P.S. I also heard that Google's Hangouts will be able to make/receive calls soon (hopefully), so if it comes before May, we may be ok. iOS version of hangouts already has this feature, which is messed up.