AT&T fell by 3.05% to trade at $29.87 by 17:13 (17:13 GMT) on Monday on the NYSE exchange, down 3.05% on the day.
The greenback jumped on Monday amid reports of the U.S. and China signing a trade deal by the end of the month.
Wall Street's main indexes went nowhere fast on Thursday with better-than-feared GDP data providing some support to counter the abrupt end to a U.S.-North Korean summit and ongoing concerns about earnings and U.S.-China trade relations.
The U.S. dollar was flat against a basket of major currencies Thursday as stronger U.S. economic data raised expectations the Federal Reserve may consider hiking rates this year.
Kia Motors Corp and affiliate Hyundai Motor Co said on Thursday they are recalling around 534,000 additional U.S. vehicles at risk of engine fires.