“.... block your number...”
You can’t block your number if you’re calling a toll-free number. The owner of the toll-free number can opt to receive the caller ID info with the call. Not all TF owners choose to get that info (extra cost), but many do.
Cuomo will.
https://en.wikipedia.org/wiki/Caller_ID_spoofing provides a broad overview of how Caller ID is compromised.