"Could not activate cellular data network" message  on iPhone 3GS (iOS 4.1)

May this year I purchased a brand new iPhone 3GS 16GB from Vodafone on a 24mnth plan with 2gb of data monthly for mobile and tether use. The 3G and normal gsm data alwyas worked in areas where it was avalible until 3 months ago. In safari i would get a message stating that "Could not activate cellular data network" and in all apps no internet serivces worked unless wifi was activated.
I put my sim in my n95 and my 5800 and internet worked on both. I got my number put onto a new sim card. I restored iPhone. I updated iPhone to 4.1 and reset all network settings.
Nothing worked and apple came to the conclusion that it was a faulty handset and replaced it on saturday. Today when I woke up, the same message appeared!!!!
Please anyone help
Message was edited by: r.spiroski

I am having similar problems.
My network settings are correct and I can communicate both over 3G and WiFi.
However, every few minutes the connection is being dropped. A few seconds later it's back again. I can see this in an application I am developing. It's rather frustrating...
In the console I see this message prior to the connection being lost and rebuilt:
"Mon Sep 20 09:44:58 PeterVs-iPhone-3GS configd[23] <Notice>: network configuration changed."
I have not changed anything to the configuration. What's even more strange is that I ONLY have 3G at this moment, i.e. WiFi is disabled.
What is changing the network configuration? And why does it mean that the current network connection needs to be torn down and rebuilt? After the network is back, there is no difference than before. So it gets torn down and rebuilt for no apparent reason.
I have logged a bug with Apple over a week ago, but haven't had any reply from them yet. I need more information about what is happening, and how I can prevent it. I'm not very happy having to grope in the dark, having to make guesses because somebody decided that he knows what's best for me.
This is happening on multiple iPhones with multiple different OS-es. So I am guessing it is related to my carrier (Vodafone). But I can't verify it because I'm not getting the tools from Apple.

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