Mobile carrier Cellcom confirms cyberattack behind extended outages

Wisconsin wireless provider Cellcom has confirmed that a cyberattack is responsible for the widespread service outage and disruptions that began on the evening of May 14, 2025. The incident disrupted voice and SMS services for customers across Wisconsin and Upper Michigan, leaving subscribers unable to make phone calls or send text messages. Today, after days of just calling it a technical outage, Cellcom CEO Brighid Riordan has confirmed what was already suspected: that the company suffered a cyberattack. "We experienced a cyber incident. While this is unfortunate, it's not something we were unprepared for," reads a letter from Cellcom CEO Brighid Riordan. "We have protocols and plans in place for exactly this kind of situation. From the start, we've followed those plans — including engaging outside cybersecurity experts, notifying the FBI and Wisconsin officials, and working around the clock to bring systems safely back online." "The incident was concentrated on an area of our n ... Read full article.