I have an iPhone 3G 16GB from the US - bought with FW 3.0.1 (UL/JB). I wanted to use the phone in Germany with Alice/O2. I updated the FW to 3.1.3 and then to 4.2.1 (8C148) always preserving the Baseband at 04.26.08.
What I am really annoyed of - and i tried a lot over the time - is that neither EDGE not 3G works continuously. That means I can get my mails checked once with 3G or EDGE, but then I always get an error "No internet connection" although I see that the phone has an IP etc. If I want to get mails once more, it fails and I have to reboot the phone - then the first time works again and fails later. If the first thing I try after turning on 3G or EDGE is surfing a website on Safari, it may load the very basic structures (no images) and then gives a simimlar error message "Safari cannot open the page because it is not connected to the Internet" [if i lookup with SBSsettings I see that the phone has a Data IP Address and must therefore BE CONNECTED!].
This is my very last try i guess to make it work by getting help from some experts.
Thanks in advance for your help and time!