Using a factory unlocked iPhone 4 in Brazil

I have a factory unlocked iPhone 4 that I bought at the Apple Store in the US. I am now in Brazil and got a TIM SIM card, cut it down to size, and put it in the phone. The seems to recognize the card, but on says 'No Service' in the top left of the screen. I cannot figure out how to get this working with the TIM network.
Any ideas?
Thanks,
David

TIM is a supported carrier. You should not need to cut down a SIM, they should be able to provide you with a micro-SIM for your phone.
You will need to contact them.
As with AT&T in the US, they may not support pre-paid accounts on the iPhone.
No service may also indicate that you are simply not in the service area.
Either way, you need to contact the carrier to see what's wrong.

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