Exhibit 99.1 NEWS RELEASE As previously announced, TDS will hold a teleconference on May 3, 2024, at 9:00 a.m. CDT. Listen to the call live via the Events & Presentations page of investors.tdsinc.com. TDS reports first quarter 2024 results 2024 guidance reaffirmed CHICAGO (May 3, 2024) — Telephone and Data Systems, Inc. (NYSE:TDS) reported total operating revenues of $1,262 million for the first quarter of 2024, versus$1,303 million for the same period one year ago. Net income (loss) attributable to TDS co ...