The following plugin enables you to hide any part of the post which will become accessible following the password activation. In case user didn't pay yet, payment via SMS instructions will be offered.
You decide for how long or how many times password can be used in order to access the hidden content. All real time SMS are transferred to your server and stored in a table, activated password check occurs locally on your server.
How to use:
To hide content, put in page thus tags - [smscoin_rkey] Hidden text [/smscoin_rkey]
Plugin settings appear in admin panel.
Plugin designed for platform version 1.5.2 and higher.
To be able to use the following module you first must register
as well as connecting to sms:key service.
Registration and setup process are absolutely free.
Link: Download plugin
SmsCoin - Best sms-billing for you!