If you want to stop pizza SMS adverts, you will have to pay
If you receive an SMS advert from a pizza joint, should you have to pay to reply "Stop" and opt out?
And if you do decide to reply "Stop", how long should you have to reply before your opt-out is no longer valid?
Opt-in: You only receive direct marketing you have consented to receive or which is relevant to a recent commercial relationship you had with the sender.
Opt-out: You only stop receiving direct marketing when you ask to stop receiving it through unsubscribing from a distribution list.