Will a Prepaid AT&T Sim Card work in an Unlocked Samsung Impression?

I have a little stupid Nokia phone, bought from wal mart (recently), and it came with a sim card, i activated it. i am tired of this little nokia so i ordered an unlocked samsung impression off of ebay. if i just put my simcard in that when i get it, will it work?
 
yes it will work jus fine...also if in the future if you see an at&t phone that is not unlocked and you want to buy it..it will also work
 
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