Orange Belgium has suffered a major data breach in which an attacker accessed the personal information of approximately 850,000 customers, with SIM card numbers and Personal Unblocking Key (PUK) codes among the most sensitive details exposed.
The breach, disclosed in a press release dated August 20, 2025, immediately raised concerns about the increased risk of SIM swapping—a fraud technique in which criminals gain control of a victim’s phone number by transferring it to a SIM card under their control. This enables them to intercept calls and messages, including those containing one-time passcodes for multi-factor authentication, potentially bypassing account security measures.
The compromised data included customer first and last names, phone numbers, SIM card numbers, PUK codes, and tariff plan details. The company stressed that no passwords, email addresses, or banking and financial information were accessed.
Upon detecting the intrusion in late July, Orange Belgium claims it promptly blocked access to the affected system, tightened security, and notified law enforcement. Affected cus
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