I know - steer clear of anything with 2.0 in the title.
Fool that I am, I decided to install the tempting new phone software that iTunes offered me. I retired to put the kettle on - as is tradition with Apple software updates.
Not this time. The new firmware appeared to install ok but then failed to connect to the iTunes store to activate itself.
So - I appeared to have an iBroken iPhone. Still I could call 999. And
had I read this earlier - I'd have steered well clear for another few days. Mr Skinner - you may laugh out loud now at my foolish early adoption.
Anyway - I tried again a bit later and all appears to be well now. Clearly Apple's servers were a tad overloaded by the demand. Perhaps next time they'll plan for this?