One click flow

Does a mobile visitor to page (lets assume they are on 3g with the right carrier for the offer) simply tap the subscribe button and automatically get billed OR do they tap the button and then have a pin # messaged to them which they have to re-enter onto the page? So I have read different things about this billing method and I want to find out what is right.

when I visit the webpage on my wifi laptop I am redirected to the page where it asks for my number, whereas I don't know what it looks like for someone in that geo on 3g and on the right carrier for that offer?

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