This happens to me sometimes as well though it works more often then it doesn't. I find the best way to cure it is to pull the battery, resend the service books and then wait a little while after it has booted up. It happens on every OS I have tried so far so I'm putting the blame at vodafones door.
Interestingly, the problem occours more often when using bolt or opera then the default browser.
Sorry I can't be more help.
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