Surely that's the responsibility of the providers, though? Apple can improve the situation a bit, maybe, but you'd really need to get AT&T & co to crack down on it to have any chance of solving it for good.
I know that I've had approximately zero spam on my German number (that I've had for ~2.5 years) - I'm sure why, whether I'm just lucky, or whether it's much more under control here. My UK number definitely had problems with spam, though. Maybe a couple of spam calls a week.
Nice, glad to hear it's at least reasonable elsewhere, It's very, very bad in the US, at least for my partner and I. We started getting unsolicited calls days after starting the house buying process because the credit reporting companies sell you off immediately. Very frustrating.
I know that I've had approximately zero spam on my German number (that I've had for ~2.5 years) - I'm sure why, whether I'm just lucky, or whether it's much more under control here. My UK number definitely had problems with spam, though. Maybe a couple of spam calls a week.