SIM Swap Scams in Denmark
Criminals port Danish mobile numbers to intercept MitID authentication and drain Danish bank accounts or access government services.
Part of: SIM Swap Scams
Last reviewed: 1 June 2026
Denmark's MitID digital-identity system is directly linked to mobile numbers, making SIM-swap fraud particularly impactful. Attackers who successfully port a Danish mobile number can intercept MitID push notifications and use them to authorise bank transfers, sign contracts, or access public services.
Danish carriers (TDC, Telenor, Telia) have strengthened identity checks, but social engineering remains a known attack path. The Danish Centre for Cyber Security (CFCS) and Danish banking sector jointly publish guidance on MitID security.
How this scam works on Denmark
Attackers gather victim data through phishing or data breaches, then contact a Danish carrier impersonating the victim to request a SIM replacement. Once the swap completes, the victim's phone loses signal.
The attacker uses the new SIM to receive MitID push notifications, logs into the victim's e-banking, and approves transfers via MobilePay or bank wire before the victim realises the number has been ported.
Following the attack, some scammers contact the victim posing as 'bank security' to extract additional account details while the victim is in distress.
Common red flags
- Your phone unexpectedly loses all mobile signal
- Carrier SMS alerts you to a SIM change you did not request
- Unexpected MitID authentication requests arrive without any action on your part
- Bank notification of a login or transfer you do not recognise
- Carrier confirms a recent SIM swap you do not authorise
How to protect yourself
- Add a PIN-lock to your SIM via your Danish carrier's portal or store
- Enable MitID activity notifications through your bank app
- Never approve a MitID request you did not personally initiate
- Contact your carrier and bank immediately if your phone unexpectedly loses signal
- Use additional authentication factors beyond MitID push where your bank offers them
- Report confirmed SIM swaps to Politi at politi.dk and CFCS at cfcs.dk
How to report it
- Call your carrier's fraud line immediately and request a port-freeze
- Contact your bank's 24-hour fraud line
- Report to CFCS at cfcs.dk and file a report at politi.dk
Frequently asked questions
How does MitID differ from NemID with respect to SIM-swap risk?
MitID relies more heavily on a smartphone app. Adding a SIM PIN and disabling SMS as a fallback authentication method reduces (but does not eliminate) SIM-swap risk.