ATT AT&T running on1900mhz in San Antonio?

My iphone took a lemonade bath so I decided to get something that had everything I wanted (video plus I can watch tv on this phone, has 2 cams & 1 of them is 5mp).I just bought a ANYCOOL C9000 cell online I'm assuming this is a knock off of the Korean cell company Anycall, anywhoo.

This phone is almost perfect it has just about everything I want but the PHONE part isn't working!! This is a tri-band phone.
I did check out a coverage map that says ATT does operate in 1900mhz in my area but I can't find that from ATT it's self. I wasted a good 20 minutes at ATT waiting for a rep who didn't know much & told me to call the 1800 #! Whos does use 1900mhz in San Antonio?