Will my AT&T sim card work with an unlocked smart phone?

albert p

New member
I was considering buying an unlocked smart phone or just any with touchscreen. But, my current plan only allows me to make phone calls. I can't text or picture message, email, or access the internet. I wanted to buy a new phone like: a Blackberry Bold or Samsung Mythic or even an HTC Pure or Aria. Will my sim card allow a smart phone to function or basically make phone calls?
 
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