On my home wifi network with the iPhone when I "slide to unlock" will be on 3G for about 20-30 second before switching over to wifi and will be using the 3G for that amount of time. Anyone think this will occur with the iPad 3G? The reason I ask is cause if I purchase 250megs and a friend grabs my iPad and starts surfing, I dont want to be using precious bites. I could just turn off 3G while at home, but might not always remember to do so.