AFAIK the carriers require a double opt-in for this. The first opt-in, which the Medium article describes, can be online with boilerplate language. But then you have to opt-in a second time by replying to an SMS sent…
AFAIK the carriers require a double opt-in for this. The first opt-in, which the Medium article describes, can be online with boilerplate language. But then you have to opt-in a second time by replying to an SMS sent…