1. Eh, OK, you're probably better off using zRTP directly with your contacts. Silent Circle doesn't seem to actually say how your calls are any more secure. In a recent thread, they say they hand them off to a VoIP carrier and consider that "encrypted to the PSTN". IIRC part of Silent Circle's play is that they think the government cannot compel them to do "bad" things, so they're telling us to trust them on that basis.

2. One of a ton of services that cost like $3-4 or so a month and will probably fall. And sure, it prevents the local WiFi from running sslstrip at the cost of putting all your traffic at an easy-to-monitor place (the VPN provider).

3. A closed source program running access to all your data doesn't sound particularly impressive. But sure, it's better than using Dropbox.

4. Kismet Wifi manager is $2.99 on Google Play.

It might be better than nothing, but the product sounds seriously over-hyped, and some of their claims seem like outright lies or at best misleading/useless.

I also don't get, if such a combo of services was so valuable, why someone just doesn't sell it separately.