Id just get a simple phone for calling then and use the tablet for surfing the net away from home. That way you have good voice coverage, home internet for when you are home, and the tablet for on the go.
Then why not do the above?
Why? The whole reason I have a cell phone, tablet and laptop is for mobile computing. My low signal gives me about 600K down which isn't much slower then typical granny DSL from Verizon. I don't use cellular data when I'm at home, if my cable modem went down, or the power went out 600K would work for me until the service gets restored. Or I could just go outside, sit in the backyard and get 2Mb down. Neither AT&T or Verizon give me anything better so its a moot point. As long as I can use voice at home that's fine with me.
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