Cellcom

Cellcom, a regional wireless provider in Wisconsin, experienced a cyberattack that disrupted voice and text services for its customers, leaving many unable to make calls or send messages. The outage, ongoing for several days, caused significant frustration and operational hardship for users. While the company confirmed that no personal or sensitive customer data was compromised, the incident led to potential risks of scams exploiting the service interruption. Cellcom engaged external cybersecurity experts and notified authorities, including the FBI and Wisconsin state officials, to address the breach. The CEO assured customers that the company was prioritizing security over speed in restoration efforts and would compensate users for the downtime. Despite progress, full service recovery remained delayed, highlighting the attack’s disruptive impact on communication infrastructure and customer trust.

Source: https://thecyberexpress.com/cellcom-cyberattack-discupts-calls/

TPRM report: https://www.rankiteo.com/company/mycellcom

"id": "myc0155301112725",
"linkid": "mycellcom",
"type": "Cyber Attack",
"date": "5/2025",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"

{'affected_entities': [{'customers_affected': 'Significant number (exact '
                                              'figure not specified)',
                        'industry': 'Telecommunications',
                        'location': 'Wisconsin, USA',
                        'name': 'Cellcom',
                        'type': 'Regional Wireless Provider'}],
 'customer_advisories': ['No personal data compromised, but customers warned '
                         'to be cautious of scams',
                         'Company will cover the downtime for affected '
                         'customers'],
 'data_breach': {'data_exfiltration': 'No evidence',
                 'file_types_exposed': 'None',
                 'number_of_records_exposed': '0',
                 'personally_identifiable_information': 'None',
                 'sensitivity_of_data': 'None (no sensitive data impacted)',
                 'type_of_data_compromised': 'None'},
 'description': 'Cellcom, a regional wireless provider based in Wisconsin, '
                'experienced a cybersecurity incident that disrupted '
                'customers’ ability to make phone calls and send text '
                'messages. The company reported no evidence of compromised '
                'personal data but warned customers to remain vigilant against '
                'potential scams. Restoration efforts are ongoing with the '
                'assistance of external cybersecurity experts, and the FBI and '
                'Wisconsin state officials have been notified. Cellcom has '
                'committed to covering the downtime for affected customers.',
 'impact': {'brand_reputation_impact': 'Potential erosion of customer trust '
                                       'due to service disruption and '
                                       'prolonged restoration',
            'customer_complaints': 'Reported frustration and hardship among '
                                   'customers',
            'data_compromised': 'None (no evidence of personal data being '
                                'accessed or stolen)',
            'downtime': 'Ongoing (as of latest update; duration unspecified)',
            'identity_theft_risk': 'Low (no evidence of data compromise, but '
                                   'customers warned of scam risks)',
            'operational_impact': 'Significant disruption to customer '
                                  'communication services; heightened risk of '
                                  'scams exploiting the outage',
            'payment_information_risk': 'None reported',
            'systems_affected': ['Voice services', 'Text messaging services']},
 'investigation_status': 'Ongoing (with external cybersecurity experts and law '
                         'enforcement involvement)',
 'recommendations': ['Customers advised to remain vigilant for scams '
                     'exploiting the service outage',
                     'Company emphasized the importance of not rushing '
                     'restoration at the expense of security'],
 'references': [{'source': 'Cellcom CEO Video Message and Customer Letter'},
                {'source': 'Public Updates from Cellcom'}],
 'regulatory_compliance': {'regulatory_notifications': 'FBI and Wisconsin '
                                                       'state officials '
                                                       'notified'},
 'response': {'communication_strategy': 'CEO video message, customer letter, '
                                        'and public updates emphasizing '
                                        'transparency and reassurance',
              'incident_response_plan_activated': 'Yes',
              'law_enforcement_notified': 'Yes (FBI and Wisconsin state '
                                          'officials notified)',
              'recovery_measures': 'Progress being made, but full restoration '
                                   'may take additional time',
              'remediation_measures': 'Ongoing restoration efforts with '
                                      'emphasis on security',
              'third_party_assistance': 'Yes (external cybersecurity experts '
                                        'engaged)'},
 'stakeholder_advisories': 'CEO Brighid Riordan addressed customers via video '
                           'message and letter, acknowledging hardship and '
                           'outlining restoration efforts',
 'title': 'Cellcom Cybersecurity Incident Disrupting Voice and Text Services',
 'type': 'Cyberattack (Service Disruption)'}