3g is not working but 2g is fine - could this be a hardware problem?

Just recently updated to IOS6 and now can't get 3g, but I also dropped my phone at the same time.
I've tried all the resets and changed SIM and the issue is definitely with the handset either hardware or software installed on it.
Is it possible that I've dammaged the 3g antenna? I get 2g fine, and wifi fine, so I guess my question is does the iPhone have seperate antennas for 3g?
Thanks
Dave

It very likely could be a hardware problem.
Are you certain that you did not simply disable 3G? Check Settings > General > Network > Enable 3G to ensure it is ON.

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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