In may my old phone contract will expire that means I can go for a phone upgrade and am considering the Nokia Lumia 710. Can I use the WiFi on this phone without the data plan? I DO NOT want to start paying for a data plan. I saw in the manual where you turn the WiFi on and off, but will the phone want to force me to use ... , but if I walk to the wrong part of the room and lose my signal I don't want to be paying for per usage on the phone's 4G. Any information on this?