The American Telephone and Telegraph Company (AT&T for short) has a long history dating back to Alexander Graham Bell in 1882 in Boston, Massachusetts.
In recent history, the company was known as SBC Communications after the government break-up of the original AT&T in 1983.
SBC purchased AT&T in 2005 and took on their brand, logo, and marketing for the entire company.
In 2006, the company acquired BellSouth.
In 2008, the AT&T corporate office moved from San Antonio to Dallas.
There have been many recent acquisitions including Cellular One, Centennial Communications, Wayport Inc. and Qualcomm. 
In September 2018, the company announced that it has introduced a suite of blockchain solutions to allow enterprises in various industries to track and manage information more efficiently.
AT&T is currently the largest provider of fixed and mobile telephone services in the US. The company currently serves over 100 million mobile customers.
