I read about problems with some aplications when using upgrade
from DevTeam. So I have question:

Can I upgrade my iPhone (it's not on contract with any AT&T or O2-UK)
using iTunes and then Just Activate it in any way without Jailbreaking (as
there are some problems after with some apps) I don't need all that
stuff from installer anyway.

I have HyperCard for 1.1.3 so Ulocking doesn't bother me