I'm set up with my cell phone to use my wireless connection IF in range... but if my modem goes out it automatically clicks over to the cell tower.
About phone service.. and some of the people on this board know this... I almost don't have a phone anymore... service is so bad, spotty. If I'm in my house I can't keep a connection.. or rather, it's rare than I can. I'll hear my phone ring but I can't answer, it won't connect. So I know what you're thinking, "How do you live without a phone"?
Well, that bugged me for a long time, and I worked on the problem a LOT... bought devices to improve service, etc.... but then I made an amazing discovery.... I don't care that I can't use my phone, and basically have no phone. That aggravates the living hell out of people trying to call me... BUT... I comfy being cut off.