Stop fraudulent calls and SIM swap fraud

Telecoms providers detect fraudulent calls and SIM swapping

Needs setupAI Act: no extra obligationsFinding anomalies & fraudTelecommunications

Fits: IT & software development · Legal & compliance · Customer service

When fraudsters have a phone number moved to their own SIM card to intercept confirmation codes for bank accounts, the sequence of events gives it away. Bait calls from expensive premium-rate numbers and mass calls are detected before many customers call back.

Is this for you?

  • You offer mobile services and have had cases in which customers lost money after a SIM swap.
  • Events such as SIM swaps, password changes, call forwarding and call patterns are stored and can be linked.
  • Network operations, customer service and the security team can jointly carry a project over several months.
First step today

Create a table of about twelve invented customer events: a normal SIM swap in a shop, a swap via the hotline with call forwarding shortly afterwards, a device change with an eSIM. Have them checked with the template below and see whether the normal device change gets through.

How to go about it

  1. Define fraud schemes and warning signs
  2. Link customer, sales and network events
  3. Set up rules and a model for real-time detection
  4. Have suspicious cases checked by the fraud team
  5. Define protective measures
  6. Adapt detection to new schemes

Templates to copy

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The complete guide

  • 6 steps explaining exactly what to do
  • 3 proven templates to copy into your own AI
  • Safe use: data, checking, deciding, informing
  • Pitfalls, effort and how to recognise success

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Same approach, other use cases

12 more use cases follow the pattern “Finding anomalies & fraud”.

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TK-03 · Legal status 08.10.2026