** Shares of telecom operator AT&T T.N rise ~3% to $27.8 in premarket trading
** Company adds 324,000 net monthly bill-paying wireless phone subscribers in Q1, above FactSet estimate of 258,300 additions
** Co says more than 40% of AT&T customers that use fiber also opted for its wireless plans
** Q1 revenue rose 2% to $30.6 bln vs estimates of $30.35 bln - LSEG
** Up to last close, stock had risen 18.4% YTD
(Reporting by Harshita Mary Varghese in Bengaluru)
((HarshitaMary.Varghese@thomsonreuters.com))