Odido Data Breach 2026: 6.2 Million Customers Exposed in Major Cyberattack

What is the Odido Data Breach?

Dutch telecommunications giant Odido has suffered one of the largest data breaches in Netherlands history, exposing sensitive personal information of approximately 6.2 million customers in a major cyberattack discovered on February 7-8, 2026. The breach represents a significant cybersecurity incident affecting nearly all of Odido's customer base, with hackers infiltrating the company's customer contact system and downloading extensive personal data including names, addresses, phone numbers, email addresses, dates of birth, bank account numbers, and identification document details.

Background and Context of the Attack

Odido, formerly known as T-Mobile Netherlands, is the largest mobile phone company in the Netherlands with approximately 6.9 million customers. The company rebranded in September 2023 to unify T-Mobile and Tele2 Mobile services under one brand. This breach comes at a critical time for the telecom sector, which has seen increasing cybersecurity threats to critical infrastructure across Europe. The incident was first detected over the weekend of February 7-8, 2026, when unusual activity was identified in the customer contact system.

'We deeply regret this incident and are fully committed to limiting the impact,' stated Odido CEO Søren Abildgaard in the company's official response. 'Our operational services have not been affected; customers can continue to call, use the internet, and watch TV safely.'

What Data Was Compromised?

Information That Was Leaked

The cybercriminals accessed and downloaded the following customer information:

• Full names and addresses
• Mobile phone numbers and email addresses
• Customer identification numbers
• Bank account numbers (IBAN)
• Dates of birth
• Passport or driver's license numbers and validity dates

Information That Was NOT Compromised

Odido has confirmed that the following data remained secure:

• Customer passwords and login credentials
• Call history and usage data
• Location tracking information
• Billing and invoice details
• Scans or copies of identity documents

Odido's Immediate Response and Security Measures

Following the discovery of the breach, Odido implemented several critical security measures:

1. Immediate Access Termination: Unauthorized access to the customer contact system was blocked within hours of detection.
2. External Cybersecurity Experts: The company engaged third-party security specialists to investigate and implement additional protections.
3. Regulatory Reporting: Odido reported the incident to the Dutch Data Protection Authority (Autoriteit Persoonsgegevens) as required by GDPR regulations.
4. Customer Notification: Affected customers began receiving personalized emails from info@mail.odido.nl or SMS notifications detailing what specific data was compromised in their case.

Potential Risks and Customer Protection Steps

What Cybercriminals Could Do With the Stolen Data

The exposed information creates several potential risks for affected customers:

• Phishing Attacks: Criminals may impersonate Odido, banks, or other trusted organizations to trick victims into revealing additional information or making payments.
• Identity Theft: With names, addresses, and identification numbers, fraudsters could attempt to open accounts or apply for services in victims' names.
• Targeted Scams: Personalized approaches using known personal details to increase credibility of fraudulent communications.

Recommended Protective Measures

Odido and cybersecurity experts recommend the following steps for affected customers:

1. Be Vigilant with Communications: Carefully scrutinize unexpected emails, text messages, or phone calls, especially those requesting personal information or payments.
2. Verify Contact Sources: Check email addresses and phone numbers carefully - legitimate Odido communications come from info@mail.odido.nl.
3. Monitor Financial Accounts: Regularly review bank statements for unauthorized transactions.
4. Use Strong Authentication: Enable two-factor authentication where available, though Odido confirms passwords were not compromised.
5. Report Suspicious Activity: Contact Odido directly through official channels if you receive suspicious communications claiming to be from the company.

Regulatory and Legal Implications

The breach has significant implications under the European Union GDPR regulations, which require companies to report data breaches within 72 hours of discovery. The Dutch Data Protection Authority (AP) is likely to investigate whether Odido had adequate security measures in place. Under GDPR, companies can face fines of up to €20 million or 4% of global annual turnover for serious violations.

Odido's handling of the breach follows established protocols, including immediate notification to regulators and affected customers. The company has emphasized transparency throughout the process, maintaining a dedicated information page with regular updates.

Industry Impact and Cybersecurity Trends

This breach highlights broader trends in telecommunications cybersecurity challenges. Telecom companies manage vast amounts of sensitive customer data, making them attractive targets for cybercriminals. The incident follows similar breaches at other European telecom providers and underscores the importance of:

• Robust security monitoring for customer relationship management systems
• Regular security audits and penetration testing
• Employee training on recognizing phishing attempts
• Implementation of zero-trust security architectures

Frequently Asked Questions (FAQ)

How do I know if I'm affected by the Odido data breach?

Odido is sending personalized emails to affected customers from info@mail.odido.nl. If you haven't received notification, check your spam folder. No notification likely means your data wasn't compromised.

Should I change my Odido password?

No password changes are necessary since login credentials were not compromised. However, if you use the same password elsewhere, consider updating those accounts.

Can I cancel my Odido contract because of the breach?

The data breach itself doesn't constitute grounds for contract cancellation under Dutch consumer protection laws.

Has the stolen data appeared on the dark web?

As of February 2026, Odido reports no evidence that the stolen data has been published online, but monitoring continues.

What about Odido's other brands (Ben and Simpel)?

Ben customers were affected and have a separate information page at ben.nl/veiligheid. Simpel customers were not impacted.

Sources and Additional Information

For ongoing updates, visit Odido's official information page at odido.nl/veiligheid. Additional resources include the Dutch Data Protection Authority at autoriteitpersoonsgegevens.nl and cybersecurity guidance from the Dutch National Cyber Security Centre.