Block incoming call prefix

[jesus2099]

Checklist

• I am using the latest version - 1.6.1
• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

Describe the feature you want

I wish I could have a black list of numbers and number prefixes to block

Is your feature request related to a problem? Please describe it

To avoid being annoyed by spam.
In France we have a list of known spam prefixes

Genuine Android 9 Redmi 7 Call app includes this blacklist feature but it stopped working on May 2026.

Additional context

If I had Android 10+ there are companion apps to handle this
But I'm on Android 9 Redmi 7, where it requires a Call replacement app, like Koler.

How will you/everyone benefit from this feature?

Android 9 users would be able to get this feature.
Android 10+ users who already use Koler wouldn't need to install a distinct companion app for blacklist feature.