HTC Wildfire 3G network not working (UK)?

Hi,
My other half recently bought an HTC Wildfire but the only thing is, his 3G isn't connecting and/or working. This means his internet is dead slow and stop and he doesn't have a wireless modem at home, so basically he can't use the internet, facebook, emails. I currently have a Blackberry 3G, with a 3G sim card, and my 3G works perfectly in main cities and in our local town. So I was wondering, if my other half bought a 3G sim card, do you think this may fix the problem? (He is currently on O2 if that helps)
 
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