In other words, text messages are not sent via WiFi.
If you have no reception at all in your house (3G or 1X) then you won't be able to send/receive text messages.
The only exception I can think of is possibly if you're using Google Voice but I don't know if it will send/receive over WiFi or not.
No you don't.You can send emails through wifi, but i THINK that you need 3g for txts.
Hate to burst your bubble, but no matter what your using, GV Call always uses the voice network to make/receive calls. It may use data to grab stuff from the servers for the program, but as for actually making/receiving calls on your gv # it's all on the voice network.SMS - Voice network (which is why there is a limit on characters)
MMS - Data network
Call - Voice network
GV SMS - Data network
GV Call - Voice network, but if you use the app, it uses data