I'm looking at switching to verizon, since they have the best coverage where I live. But their plans are a lot more expensive than the legacy tmobile plan I'm on currently. It seems that I should be able to rely on gv for free calls and texts as long as I have data coverage. Is it reliable enough that between 3g and wifi I'll be able to make and receive calls and texts the same as if I were using minutes? Does verizon even offer data only plans? Anything else I need to know about gv?