What is GSM ?
http://en.wikipedia.org/wiki/GSM
What is the relationship between ATT and GSM ?
http://www.wireless.att.com/learn/why/technology/mobile-broadband-and-GSM.jsp
What is GSM Carrier?
http://www.ebay.com/gds/GSM-and-CDMA-Guide-/10000000009189079/g.html
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