To do this: press and hold both the Main Menu button at the bottom of the handset and the power button at the top.
You need to continue holding both buttons down (ignoring the ‘Slide to turn off’) until theApple symbol appears in the middle of the screen.
Once the Apple screen appears you can release the buttons and let the iPhone reboot.
To manual roam you need to go into the ‘Settings’ menu from the main screen.
Then select ‘Carrier’ and switch ‘Automatic’ to ‘OFF’, this will start searching fornetworks (this can take a few minutes).
Select a network that is not Vodafone and leave this for 1minute. Now turn ‘Automatic’ back to ‘ON’.
The phone will then search for, and connect to Vodafone.