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the bad thing about SMS billing is that you migh have problems for users from abroad due to their telephony companies.
for instance here in spain you can only have SMS billing from users coming from spain. users have to send 3 SMS to a premium number that in total costs them 1 euro or so. then they have a SMS back with a password to access the site for certain period of time (onde day, two , three, it depends).
if you wanna use that kind of billing, i suggest you use a simple dialer: it is easier and valid for every user around the world.
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