Yes I can enter phone menu with onesim and sync is finished, but when I put another unaccepted card i get screen like never activated. I done activation as you describe before couple of days on my iPhone and other customer phones without any problem, my iPhone is also from swisscom, but I don't know what wrong with this one. Phone came for reflashing because cydia disappear, I try on 3.1.3 and also on 4.0.1 but same situation. I try too much jailbreaks with blackra1n,spirit,redsn0w,jailbreakme.com
maybe something from jailbreaks stay even I restore after that phone in dfu mode.
I solved problem with other customer who came in my service with swisscom card and phone was activated not instant, is activated when catch network in roaming in my country Macedonia, and appear "IPhone is activated"
I read from swisscom card info "Submit operator" and sended to your server
Thanks for your help, Br