Apparently this[0] is a possible way of opting out by phone but can't speak to it personally as I haven't tried it https://news.ycombinator.com/item?id=2770309

Apparently this[0] is a possible way of opting out by phone but can't speak to it personally as I haven't tried it https://news.ycombinator.com/item?id=27703091#27705428 https://news.ycombinator.com/item?id=27703091#27705428