I just this minute lock away broke an iphone 3G S beside the OS 3.0.1 installed. No cell phone signal. What's up?

I inserted my t-mobile SIM Card that has internet service and used three different AT&T SIM Cards that has internet service, but I'm getting no bars and the cell company's logo isn't appearing. I'm at the unlocking stage and can't unlock due to no bar. What can I do? Should I re-jail break? If that doesn't solve it, what else can be done? I'm stuck, HELP!
Answers:
Use Wifi to download UltrasnOw and unlock it.


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