The consent doctrine the whole platform enforces. This page is the floor, stated publicly.
A keyword text to your number. A signed card. A web form naming the campaign. A recorded verbal opt-in at the door. It names the sender and it's on the record with a timestamp and a source.
A purchased list. A rented list. A list from another campaign. An assumption. None of it makes a number textable on this platform, and there's no setting that changes that.
Honored the second it arrives, across the account, forever. The record keeps the timestamp. HELP gets an automatic answer naming the campaign.
Every message, from every sender, at every hour, passes consent, quiet hours, STOP status, and sender verification before it leaves. A send that fails does not go out. There is no override, and there never will be.
Accounts that try to route around consent get suspended. This policy is why Txtra traffic lands and why carriers trust the sender registration behind it.