(Reuters) - AT&amp;T Inc said on Monday that it would lower the price of its unlimited mobile data plan, as the price war among the four biggest U.S. wireless carriers gains steam.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=t-jWVcHHPEo:2cur9iSNeIk: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=t-jWVcHHPEo:2cur9iSNeIk:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=t-jWVcHHPEo:2cur9iSNeIk:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=t-jWVcHHPEo:2cur9iSNeIk:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=t-jWVcHHPEo:2cur9iSNeIk:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/t-jWVcHHPEo" height="1" width="1" alt="" />