After update 4.2.1 unable to access mobile data network

Hello,
yesterday, i have updated to 4.2.1
Today, i have activated the flight modus for a while...
Then go back into the normal modus (flight modus off). Now, the access to the mobile data network is never possible. Access via WIFI is allways ok.
Now, i have made the same with a second 3GS with 4.2.1 and the problem is reproducible. Message > " mobile data network could not be activated "
thanks in advance for help...
Th

Settings>General>Reset>Reset Network Settings...see if that helps.

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