NEW YORK (Reuters) - Verizon Communications Inc's announcement that it will once again offer an unlimited pricing plan marks a shift in its thinking as a price war among the four biggest U.S wireless carriers accelerates.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=zaT-gFTmCBk:nJbke_Mfjhw: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=zaT-gFTmCBk:nJbke_Mfjhw:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=zaT-gFTmCBk:nJbke_Mfjhw:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=zaT-gFTmCBk:nJbke_Mfjhw:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=zaT-gFTmCBk:nJbke_Mfjhw:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/zaT-gFTmCBk" height="1" width="1" alt="" />