Cellcom

Cellcom is a mobile telecommunications carrier that provides voice, SMS, and related services to customers. It operates primarily in the United States, with a noted presence in Wisconsin and Upper Michigan. The company offers number porting capabilities as part of its service portfolio. It maintains network infrastructure to support the delivery of voice and text communications.

The May 2025 cyberattack disrupted voice and SMS functionality for customers across Wisconsin and Upper Michigan. The outage also caused number porting failures in those regions. This indicates that Cellcom’s service footprint includes at least those two states. The incident led to widespread service outages affecting customers in the affected areas.

Cellcom responded to the cyberattack by engaging external cybersecurity experts to investigate and mitigate the incident. The company notified the Federal Bureau of Investigation and Wisconsin authorities as part of its response protocol. It followed predefined procedures that separated network areas to protect sensitive customer data during the event. Cellcom confirmed that no personal information was compromised despite the disruption.

Publicly available sources do not disclose Cellcom's ownership structure or parent company relationships. Therefore, details regarding any subsidiaries or affiliate entities are not specified in the provided material. The organization's headquarters is located in the United States of America, as stated in its profile. No further information about corporate governance or equity holdings is available from the given sources.

Cellcom is actively working to restore voice and SMS services after the May 2025 outage. The company expects to achieve full recovery soon, according to its statements. It remains engaged with external cybersecurity experts and law enforcement throughout the recovery process. These efforts are part of its incident response and service restoration activities.