The following plugin enables to grant user VIP role on your website.
In reply message user receives short text password (key). Following the password activation user is added with VIP role for a period of time set by you. When it expires user receives an email, and the VIP role is removed.
All real time SMS are transferred to your server and are saved in a table, activated password check occurs locally on your server.
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

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SmsCoin - Best sms-billing for you!