Spam callers have basically ruined telephone as a medium. For many, a phone call is more likely to be fake and spam than it is to be legitimate. And even if the call claims to come from a source you might trust, good odds it's spoofed and thus cannot in fact be trusted.

A shame on telecoms for not being willing to tackle the problem.

Same, the only time I answer my phone is when I want to mess with the spammers.