# Blocking & reporting – Nummernindex

> Blocking numbers, carrier billing blocks, complaints to the regulator.

- [Third-Party Billing Block in Germany: Drittanbietersperre](https://nummernindex.de/en/blocking-and-reporting/third-party-billing-block/): In Germany, a third-party billing block (Drittanbietersperre) stops other companies from charging subscriptions, app purchases or tickets to your mobile bill. Under section 61(2) of the Telecommunications Act your provider must set it up free of charge when you ask. Request it in the app, portal or by phone, and dispute unknown charges within eight weeks.
- [Block Spam Calls on iPhone, Android and German Landlines](https://nummernindex.de/en/blocking-and-reporting/block-spam-calls/): On iPhone, open Settings, Apps, Phone and set Call Screening to Ask Reason for Calling or Silence, then turn on Unknown Callers and Spam. In Phone by Google, tap a call in your history and choose Block/report spam. On a German landline, block numbers in your router or ask your provider. Filters for unknown callers beat blocking single numbers.
- [Report Scam Calls in Germany: The Bundesnetzagentur Guide](https://nummernindex.de/en/blocking-and-reporting/report-scam-calls-germany/): In Germany, scam and spam calls are reported to the Bundesnetzagentur through its online forms, one for each type of problem, such as one-ring calls, spoofed numbers or marketing calls without consent. Have the date, time, displayed number and a clear description ready. Crimes such as fraud or threats go to the police on 110 or through online police reporting.
- [Trace Anonymous Calls in Germany: The Fangschaltung](https://nummernindex.de/en/blocking-and-reporting/trace-anonymous-calls/): In Germany, you can have anonymous threatening or harassing calls traced with a Fangschaltung. You apply in writing to your own phone provider, which must then tell you which lines future calls come from, even with a hidden number. It only covers calls after your application and, according to the regulator, it is not free. Threats and stalking should also be reported to the police.

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