I just bought my wife a iPad 3g with Wifi. I brought it home, she turned it on, hooked it up to our wireless AT&T Wifi and we are off and running. Now, when we go out and about, can we set up the iPad to automatically detect a AT&T wifi hot spot and ask for log in. Anyone familiar with AT&T DSL and the iPad? With the "Cellular Service" turned on, it says AT&T where the signal strength bars are. When I turn it off, it says iPad. If I've never signed up with AT&T for an iPad plan, they can't charge me, can they?