SMS Addon module doesn't include any kind of unsecure PHP codes and it doesn't collect information about your website and/or server. It only contacts Clickatell API(or custom API) to send SMS and it contacts scriptlisans.com licensing server(if licensing server is down, it contacts secondary licensing server) and only sends license key, IP & hostname info to make your license work. Also, it contacts scriptlisans.com for new version checking. No other information collected by sms addon module. Also, it is tested in many ways to make it secure so it doesn't have any security invulnerables.
It is complately safe & secure to use.
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