Android Phone

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I've got a plan with AT&T so I have a SIM card. Now if I understand this correctly I can use my SIM card with any unlocked gsm phone? So I've been looking to get an Android phone. Anyone know where I can find a good cheap android phone? I know "cheap" and "unlocked" don't go well in the same sentence but....It's worth a shot. Does anyone have the Archos Android 3G tablet/phone? How does that work as a phone?