4G Apple Iphone 4S Help?

You have to take it to AT&T to find out. They need to enter several technical codes including the access codes for the iPhone to be on AT&T.
 
Yes. Well technically it would be AT&T's HSPA network which is not considered 4G on the grand scale but yes you would be able to use it. The unlock condition of a phone doesn't affect its ability to use those.
 
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