(Reuters) - T-Mobile US Inc reported better-than-expected quarterly revenue and profit as the No.3 U.S. wireless carrier added subscribers due to heavy discounts and promotions.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=x8BZzPfkq1c:5JBun1aJjC4:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=x8BZzPfkq1c:5JBun1aJjC4:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=x8BZzPfkq1c:5JBun1aJjC4:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=x8BZzPfkq1c:5JBun1aJjC4:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=x8BZzPfkq1c:5JBun1aJjC4:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/x8BZzPfkq1c" height="1" width="1" alt="" />