AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the largest wireless carrier in the United States, with 241.5 million subscribers as of December 31, 2023.

AT&T Mexico, S.A.U., also known as AT&T Mexico Wireless and AT&T Mexico Mobility, is a Mexican mobile telephone operator and subsidiary of AT&T. AT&T Mexico is headquartered in Mexico City. Its mobile network is available in 90% of Mexico, serving 13% of the Mexican wireless market. AT&T is the third-largest wireless carrier in Mexico, with 21.603 million subscribers as of December 2022.