Your number will not be sent to the other party.
Some states allow consumers to select per-line blocking.
Check with your local telephone company or state public service commission about the availability of per line blocking in your area. It does not. Requesting privacy on calls to 800 numbers may or may not prevent the display of one's telephone number. When you dial a toll free number, the party you are calling pays for the call. Typically, the called party is able to identify your telephone number because these calls use a separate technology called Automatic Number Identification.