Något att kanske notera innan man uppdaterar sin iphone 3g är en sak som står på blog.iphone-dev.org

"Warning: If you care about the possibility of a GSM/3G unlock in the future (there is no unlock available as yet), do not update your 3G device with iTunes unless you do it via PwnageTool 2.0.2 (this means you’ll need to create a custom .ipsw with PwnageTool 2.0.2 and install it using iTunes) - If you have updated over the last few days with iTunes, you’ll still be able to Jailbreak using PwnageTool 2.0.2 but it may reduce the chance of you being able to unlock the Phone to be able to use a SIM card from all carriers in the future."