Iphone 4s - 3G connection disappears , it's on and it's not working at all (only wi-fi "home" works and i'm not home all the time)

i  think a lot of people have the same issue with apple iphone so if someone can help me to fix it.

I'd like to confirm that I am suffering from the same issue with my 3 week-old iPhone 4S. I, too, need to turn flight mode on and off in order to convince my phone to switch back from a Wifi connection to 3G. So far I have tried the following:
- Received a new SIM from O2 here in Germany
- Restored my phone from backup
- Restored my phone as a new device
- Installed iOS 5.0.1
- Received a replacement phone from Apple
None of the above have rectified the situation, nor made any difference at all. Neither the Apple support hotline nor the Genius Bar employee had any idea what could be causing the problem. The only thing I have not yet tried is a SIM from another provider. I'm wondering if this is a problem with the iOS in combination with the setup of certain providers.
For those of you who speak german, you can follow the thread on the O2 forums here, where many users are having the same issue: http://forum.o2online.de/t5/iPhone/nach-Wlan-keine-mobile-Daten/td-p/175228/high light/false

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