No internet without wifi since upgrade to 3.0.1

I did the automatic update from the os 3.0.0 to the 3.0.1 on my iphone, since then I cannot acces the internet appart from a wifi connexion and then everything works perfectly.
I do not know what to change.

Hi,
Is Wi-Fi grayed out and not giving you the option to join a Wi-Fi network?
If it is, try the general tips in this article: http://support.apple.com/kb/TS1559
If it isn't grayed out, try Resetting Network Settings on the iPhone by tapping Settings> General> Reset> Reset Network Settings.
This article: http://support.apple.com/kb/TS1398 provides other general tips that will resolve most Wi-Fi connection issues.
-Jason

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