AT&T rose by 4.23% to trade at $37.78 by 09:31 (13:31 GMT) on Monday on the NYSE exchange.
The volume of AT&T shares traded since the start of the session was 20.83M. AT&T has traded in a range of $37.74 to $37.95 on the day.
The stock has traded at $37.8200 at its highest and $34.9100 at its lowest during the past seven days.
