[rcstank]

Credit card is easily changed. Phone number is much more difficult.

[crazygringo]

You credit card is also easily charged.

Your phone number isn't.

What is a company going to do with your phone number that you're worried about...?

[whywhywhywhy]

Not difficult at all for anyone actually wanting to abuse it

[behnamoh]

You shouldn't have to want to abuse something for it to be inappropriate to be asked.

[whywhywhywhy]

I agree just debunking the excuse that's always wheeled out for this overreach.