If I am at home where I have a wireless newtork and the wifi setting on the phone is set to ON, does data usage count towards your Verizon alllowance?
The one thing that kinda stinks about the iPhone is that if you are not actively using the Wi-Fi data connection, such as downloading an app, then it will turn off after the phone goes to sleep. I'm not sure how long the phone has to be asleep for the Wi-Fi turns off, but it does not stay on constantly like it does on the iPad. I wish Apple would provide an option to change this as I would like to constantly stay on Wi-Fi rather than jump between Wi-Fi and 3G.
You can disable cellular data in the settings app to restrict data to wifi-only