I can tell you that while it does try to make some effort to hide itself, it simply can't hide itself from other apps. So, if you were to, say, keep Astro on your desktop, it wouldn't be too many clicks before you come across a screen that shows Mobile Defense. Moreover, the site doesn't, uh.. have security questions? So, I made the mistake of registering with the gmail account that will get pushed to the phone. DO NOT DO THIS. Register with a separate email account that does not have forwarding to an account your phone has. Make a new one up if you have to. Write it down in triplicate, and keep them around in more than one of your 'safe places' around the house. DO NOT REGISTER WITH YOUR PHONE'S GMAIL. It won't cause a bug, or anything at all, but there are clear self-defeating issues with doing so, but I don't want to explicitly explain them for obvious reasons.