(Reuters) - T-Mobile US Inc reported a better-than-expected quarterly profit and raised its forecast for customer additions for full-year as heavy discounting helped attract subscribers.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=Qh_XOU-cTS4:VFm9uM3Xsno: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=Qh_XOU-cTS4:VFm9uM3Xsno:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=Qh_XOU-cTS4:VFm9uM3Xsno:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=Qh_XOU-cTS4:VFm9uM3Xsno:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=Qh_XOU-cTS4:VFm9uM3Xsno:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/Qh_XOU-cTS4" height="1" width="1" alt="" />