Lost data connectivity after upgrading iPhone 4 to iOS 5. How to fix?

Hello,
I upgraded my 16GB iPhone 4 yesterday from iOS 4.3.5 to iOS 5 and everything went fine after a few failed connections to Apple's servers, however my phone lost the data connectivity completely. Phone and SMS worked fine, I could also connect through wi-fi with no problems, however whenever I tried to use data I got a message that my phone was not signed to an internet service.
I restored my phone from the backup after upgrading. Not successful. I also reset the network configurations. No deal.
My carrier is Vivo (Brazil) and everything worked fine prior to the upgrade (and after the downgrade).
I imagine it can be a problem with APN configuration under iOS 5 and I tried to configure it through a webpage, but I got a message that my phone already had a APN config (profile) and could not install another. Under Settings>General>Network I don't have the "mobile network option" nor the "profile" option.
Any thoughts? So far I haven't contacted other people under my carrier who upgraded to see if they had the same problem.
Thanks for reading,
Samuel

I got a workaround; it's not what I wanted, but it solves the main problem.
I noticed that I only lost data connectivity after restoring from backup after the iOS 5 update. So what I did was to backup my phone, restore again to iOS 5, configure as a new phone and backup again (with nothing in the phone).
Then I launched an iPhone backup utility software, in this case, iBackupBot, which in the trial version is enough for what I wanted. I opened the old backup and exported only the files I wanted (like call history and SMS history), then I imported these files into the new backup and restored from it.
I lost my media files (which I copied before) and some configurations, but the most important itens, like SMS, I managed to export from the old (complete) backup.
Message was edited by: samuelsam

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