Re: How can you transfer anything to Twitter?
They have my number - every few months it asks me "is this your number" with my mobile number, but it was taken off SOMEONE ELSE'S phone who allowed it to download contacts. The thing you linked affects Android users, not iOS.
However, the fact they have my number but I haven't confirmed it is my number should effectively opt me out of this. They can't know if I've got a new number based on contacts probably downloaded several years ago off someone else's phone.