VOIP and Message APP that work despite T-Mobile [Optimus]?

I have been experimenting with Google-Everything and pretty well hit the limitations there. On good wifi connection at least its fast, and the integration sorta works [its missing some elements because it wants to use cell network partly for syncing]. T-Mobile blocks some features for prepaid accounts [THANKS! ... smart move T-Mobile....]

So, I'd gladly ditch all the google bloat that came on this phone and replace with
-- 1 Good TXT/SMS App that works via WIFI
-- 1 Good VOIP App that isn't nightmarish to setup & use.

I don't think the latter exists but there are a lot of App developers claiming this and that about both of these obvious needs.

Which ones work for you?