Need a dead simple VOIP option for someone that just wants to make calls on their cell -- is Ooma it?

[Mr Downtown]

I'm very happy with GV for the number portability/convenience, but I will note a certain amount of latency on both GV and Ooma (which I also have). I think it's endemic to any VOIP. There's a clumsiness where you end up talking over the other person because of half-second delays. For that reason, I keep an old-fashioned landline, despite the nuisance robocalls, which I make most outgoing calls on.