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Is it possible to block calls starting with a specific number? For instance, I want to block calls from numbers starting with 1408 as they are all spam calls. The digits following these four, keep changing.

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If you're looking for a free and ad-free/in-app-purchase-free app, you can use the open-source NoPhoneSpam, which is available on F-Droid (though not Google Play). It supports blocking calls from individual numbers and from numbers that match a pattern with wildcards.

This is especially useful for blocking "prefix spoofing" calls, that appear to start with the area code and exchange (next 3 digits) of your phone number, but really are from random law-breaking telemarketer bots.

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  • That website has a link to Google Play but when you click on that link Google Play says it does not recognize it. Searching on Google Play for "nophonespam" does not reveal anything of that specific named app..
    – bgoodr
    Commented Oct 9, 2018 at 14:59
  • Looks like it isn't in the Play Store at the moment. Someone should probably report that to the developer at gitlab.com/bitfireAT/NoPhoneSpam/issues
    – interfect
    Commented Oct 9, 2018 at 18:13
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TrueCaller also allows this. Steps to take on an Android phone:

  1. Open TrueCaller
  2. Settings
  3. Block
  4. View my block list
  5. Press the plus button in bottom-right
  6. Block a number series
  7. Enter the first six of your number
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    Be aware that Truecaller collects your data, your contacts and shares it with third parties including spammers and companies
    – Naan
    Commented Nov 25, 2023 at 10:56
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I only found ONE call blocker that is capable to block patterns (which is important for me). It is embware Call Blocker, it can block or enable numbers with Match criteria: starts with, ends with, or include specific numbers.

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  1. install F-Droid (FOSS/Open Source store) https://f-droid.org/docs/Get_F-Droid/
  2. install NoPhoneSpam by searching from F-Droid
  3. add rules from within the app to block the blocs needed in your country, for France:
  • France: : 0162, 0163, 0270, 0271, 0377, 0378, 0424, 0425, 0568, 0569, 0948, 0949
  • Guadeloupe, Saint-Martin et Saint-Barthélemy : 09475
  • Guyane : 09476
  • Martinique : 09477
  • La Réunion and Mayotte : 09478 and 09479
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