[dwaite]

For iPhone there are two tiers - the carrier provided SMS spam filtering, and apps written to provide such filtering[1].

1: https://developer.apple.com/documentation/sms_and_call_repor...

[rezonant]

Oh, so there's no builtin message filtering at all??

This explains some things. Why wouldn't they just add a spam filter. Is there still iCloud email addresses? Do they have spam filtering?