I totally bricked my iphone for a couple of days last time I tried to upgrade my OS.
I didn't realize that upgrading the OS requires access to Apple during the installation process. I only have wireless Internet that is tethered from my iPhone.
So last time I tried to upgrade, I downloaded the OS, then proceeded to run the installation, which shuts down my iPhone in order to install files. After that though, it requires some sort of verification from apple.com and because my iPhone is already shut down, i have no Internet access.
I ended up having to go to a friend's house to the install cos she has WiFi.
So is it possible to upgrade with tethered internet? Is there an option where you can do the verification before re-installing. It just seems strange cause although it may be rare to only have wireless internet, I'm sure I'm not the only person to have ever encountered this, and there was never a warning message that it couldn't be done before the installation.