Hey guys, i've got a iphone 3gs on 4.2.1 firmware jailbroken with greenpoison and I im unlocked from the 3 network to the uk o2 network using ultrasnow through cydia. Im on baseband 06.15.00 and im getting noticfications for iphone carrier settings updates, would it be safe to update without losing the unlock? Anyone done this or knows if it safe or not, please be 100% sure because I can't afford to lose my unlock and be stuck without a phone! Thanks!