AT&T revenue misses estimates as customers keep phones longer

AT&T Inc's quarterly revenue missed estimates due to lower equipment sales as customers held onto phones longer and rival wireless carriers offered new promotions on unlimited data plans, the No. 2 U.S. wireless carrier said on Tuesday.It said it lost 191,000 postpaid subscribers, who pay bills monthly, in the United States on a net basis in the first quarter ended March 31.AT&T and industry leader Verizon Communications Inc are battling Sprint Corp and T-Mobile US Inc for market share i