Jailbroke iPhone, now NO signal on ANY network? Cydia, iOS 6.0, 3GS?

I jailbroke my iPhone purely because I want to unlock it to all networks (I live in Australia and it's a British phone).
I used evasi0n and now I have Cydia installed on the phone. I also installed ultrasn0w from Cydia app store. Not only does the phone not work with my Aussie SIM card, it now no longer works with the Original simcard (it was working fine before the jailbreak).It just says "searching" and then eventually "SOS only".

Any help tech experts?

The risk of doing a jailbreak is you might brick the phone… Which is what happened here

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