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Nummernindex
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Spam & fraud

One-ring calls, scam calls, spoofed caller IDs: tactics and defences.

  • Smartphone with a dark screen in a turquoise case lying on a train table
    One-Ring Scam in Germany: Why Calling Back Costs YouA one-ring call rings once so you call back an expensive foreign number. How the scam works on German phones, which country codes to watch and how to report it.
  • Old telephone switchboard with patch panels, rotary dial and handset on a desk
    Caller ID Spoofing in Germany: Fake Numbers on Your ScreenCaller ID spoofing makes your phone show a fake number. What German networks have blocked since December 2022, which gaps remain and what to do about it.
  • Black rotary telephone on a wooden cabinet next to two small glass boots
    Fake Police Call Scam in Germany: How to Spot ItCallers posing as German police, Europol or a relative in trouble demand money or valuables. How the scam works in Germany and what real police never do.
  • Open historic telephone subscriber directory with names, office hours and notes
    Missed Call From a German Number: Who Called and Is It Safe?Got a missed call from a +49 number? How to tell landline, mobile and premium numbers apart, who might be behind it and when calling back is safe or costly.

Nummernindex is a guide published by OnlineBuilders LLC, a technology studio for SaaS, AI and data platforms. Related: Cyber security. Understanding phone numbers: area codes and number ranges, spotting spam and one-ring calls, premium-rate costs, blocking numbers and reporting abuse.

Topics: Number ranges · Spam & fraud · Blocking & reporting

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