Can I put my AT&T sim card in an unlocked phone even under contract?

nyunyuelf

New member
I am very confused to the Unlocked phone ordeal. I'm just wanting to know...if I get an unlocked HTC phone, can I put my AT&T sim card, even under contract, and still pay the same as what I normally pay (even considering the new phone will have MORE features)? How does the unlocked phone operate? Please help me understand this craziness. Thank you.
 
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