I am about to use pwnage 3.1 to update to os3.1. I am only doing this for ultrasn0w as my carrier is vodafone (official carrier is o2) so I know I must NOT update the baseband. However, I still have my working o2 sim card, so if I activate with that and switch to vodafone afterwards, I'll keep push notifications. In pwnage tool, in expert mode, under general, there's a tickbox for "activate the phone". If I untick that will the baseband be updated and lock me out? If I untick it will the baseband be left alone, but I'll activate as normal then switch sim?