Here is a good summary of SMS payments : <a href="http:&#x2F;&#x2F;www.mobiletransaction.org&#x2F;what-are-sms-payments&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.mobiletransaction.org&#x2F;what-are-sms-payments&#x2F;</a><p>They are used a lot in countries with dysfunctional banking systems. They aren&#x27;t encrypted, they use the fact that you&#x27;re sending a text from your phone to validate that it&#x27;s you.