ATT Data Plan use in unlocked cell?

[Justinian]

So I purchased an ATT Data plan with the sierra mercury usb stick. I was wondering if I purchased an unlocked phone and stuck the data plan SIM in in would it work? I see on my monthly bill that I have caller id, 3 way calling, call forwarding etc....all the phone stuff. So....can i pop it in a phone and use it?

 

[ThePianistt]

There is no included voice time with the plan. You would pay $0.40 per minute for voice calls.