"iPhone: Selectively block incoming calls when abroad: Hello, when I am abroad, I would like to block almost incoming calls from some numbers I have in my phone except some of them. Is there a way to set that? Or is there an app available? Thank you IPhone second generation with iOS 26.2 on it."
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Evading the Call:
Along with what has been mentioned by Lawrence Finch, you can evade the phone from ringing, though use of third party apps, such as Malwarebytes. I use it, and it blocks from even going through.
Malwarebytes Standard:
Malwarebytes Standard will evade all those potential hacking calls from even going through, and there is no VPN included, as dulled out on the bottom-left corner of the below screenshot. (VPNs commonly get n the way on Apple Devices). Of course, there is an exception list, just incase this is not the case. Learn more here: https://www.malwarebytes.com/pricing