You can use this - http://smscoin.net

They have special modules for dle, wp, drupal and few other cms.

For example DLE:

Tag [sms-hide] — SMS payment to access hidden content

Plugin below enables you to hide any content on your website. Instead of hidden content user will see an SMS payment instruction to access the page. User sends an SMS message, receives a password which must be entered to access the content.
Built-in functionality of the [hide] tag can be redefined as well as the possibility to give the tag a name. Detailed instructions are stored in archive.