Hi I have a 3GS iOS 4.2.1. I'm thinking about getting the unit unlocked by Orange. Apparently this can be done for a small fee. I was wondering if I do get this done, would the carrier unlock be affected if I decide to update iOS from 4.2.1? Furthermore, if I decide to jailbreak the network unlocked phone, would this have any negative effects (eg. would I have to get it unlocked again once I have jailbroken it?). Cheers for any help!