Iphone 3G only uses 3G if WiFi is turned off even if there is no WiFi

Hi,
Whenever I have WiFi turned on in my iphone 3G, if there are no WiFi networks available and I try to do anything over the Internet, it just gives an error that there is no Internet connection instead of just using the 3G connection. The only way I can force it to use the 3G connection is to go into settings and turn off WiFi. Did they make it this way on purpose? Is there a way to get it to use 3G if there's no WiFi connection without having to manually switch it off everytime I'm not at home or in the office and have access to WiFi?
thanks,
kris

The switch from an available wi-fi network to AT&T's cellular network and back again has always been automatic and seamless with nothing special required - as the iPhone is designed to do.
If the standard troubleshooting steps do not resolve this, which in order are power your iPhone off and on, reset, restore with iTunes, the next step (assuming you are in the U.S.) is calling AppleCare at (800) 694-7466, or make an appointment at an Apple Store if there is one nearby.

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