Illinois Bell, in 1971, became the first ever telephone company to offer Call waiting[citation needed], Three-way calling[citation needed], Speed Calling[citation needed], and Call forwarding[citation needed], all popular local exchange carrier telephone service options to this day.

In 1998, Ameritech announced intentions to merge with SBC, another RBOC.

Though the merger wasn't well received at first, it was allowed to occur with some conditions.

In 2001, the company started doing business as SBC Ameritech Illinois.

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