its more to do with landline phones that are still connected by wire, i cant see cordless phones or mobiles being affected as these work off a 'hang up' button
i remember as a kid, when we had a phone with cable (before mobiles were really used) if you received a call, and hung up, but the caller didnt, you get still talk to them, and you could have a 3 way conversation if you was upstairs, dont know if you can do this anymore
when my landline rings, i ignore it, itll be nobody for me, and if it is, they have my mobile number
unfortunately, my gf is dumb enough to fall for this!
