Does iPhone or ATT provide caller ID to merchants? (emergency, purchase, program)

[t0mg]

Recently, I called Great Courses to purchase a couple of their programs.

The representative volunteered my iPhone number, but my new iPhone has caller ID turned off. (in Settings, Phone, Show My Caller ID, Off). I asked how she knew my phone number, and she said "caller ID."

I leave it off because I do not want my phone number added to a database, then sold and become the target of all those awful phone calls. (Hello, is the Head of the Household available? Or, a survey. Or a charity. Etc.)

Does anyone know whether "Show My Caller ID...Off" reveals phone numbers to merchants? I suppose they would have to pay a fee or be a significant customer. I suppose it could be revealed by either Apple or ATT.

When I call friends, they cannot see my phone number.

[dontaskwhy]

The provider supplies the caller ID. You can request the carrier to block your caller ID and there is another option where you dial *67 + the dialed number to block on an individual basis.

[macroy]

There are also restrictions to caller ID. E.g. you can't block your number from toll free numbers and emergency numbers. So if the company you're calling is via a toll free number, that may be why.

[Peregrine]

Also this is not how you get on Robo Calling lists.

[t0mg]

Thanks to all who responded.
I did not know about 800 numbers reporting Caller ID (it was an 800 number).
I will ask ATT to block my number.
*67 does not work on my iPhone.
Robo calls are a nuisance, but my concern was merchants collecting numbers.

Thanks again.

[Peregrine]

What purpose would a merchant be trying to collect your number for?