Attempted purchase of T-Mobile USA by AT&T

On March 20, 2011, AT&T announced that it would purchase T-Mobile USA. On August 31, 2011, the Antitrust Division of the United States Department of Justice formally announced that it would seek to block the takeover, and filed a lawsuit to such effect in federal court. The bid was abandoned by AT&T on December 19, 2011.

Question: is t-mobile the same as at&t
Answer: no