Recieving edge instead of 3g?

I have at&t and switched from an iphone 3g to an unlocked tmobile sidekick 4g. I was getting 3g on the iphone but now I'm only getting edge on my sidekick instead of 3g! I tried everything and nothing worked to switch it back. Anyone know the problem and how to solve it!

Contact AT&T. 611 from your phone.

That's what happens frequently when you use an unlocked phone, you are typically restricted to the 2G network.

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