I have noticed that whenever I "wake" the phone using the top button when the screen first comes on it always says 3G then jumps to the Wi-Fi symbol. My 3GS did the same thing. Is the phone actually in 3G instead of wi-fi when the screen times out or is that just a "cosmetic" issue with the 3G symbol? It does receive emails in that "sleep" state. I kind of doubt it or it would be using DATA because it could jack up your data use unnecessarily grabbing pushed email.