AT&T Inc. It is an American multinational conglomerate holding company headquartered at the Whitacre Tower in Downtown Dallas, Texas.
According to https://istheservicedown.com AT&T is having issues since 03:40PM in zip code areas 60601 to 60701.
Internet Service USA also offers AT&T Internet and cable services in Chicago Illinois. AT&T is widely known for its best internet services. Having issues with an outage is not a common issue, that's AT&T connection problems due to any corrupted wires connected to AT&T providers going to its customers' lines.
AT&T Outage MAp
The Internet is the most problems encountered ranging from 39.73%, while TV is 4.97%.