iOS: Onavo Protect is a combination VPN and anti-phishing utility for the iPhone and iPad. It will notify you when a site you're visiting is insecure, when you're about to provide personal data to a phishing site, and keep your data safe from prying eyes when you're using public Wi-Fi networks on the go.
Once installed and running, Onavo Protect will pop up notifications when you're visiting a suspicious site, using a non-HTTPS site that requests personal data, or when you fill out a document that isn't submitted via SSL. The app has a notifications and alerts screen you can visit to see all of your recent activity alerts, and to toggle the VPN on and off.
When you're using Wi-Fi, the built-in VPN encrypts all of your phone's wireless traffic to offer added security from prying eyes. The app runs in the background, so you can use whatever browser you want and still be protected and get security alerts.
Onavo produces a number of apps we love, including our favourite data usage tracker for Android and its iPhone counterpart, and the Onavo Extend apps for iOS and Android, which compress mobile data. Onavo Protect builds on the technology and helps you stay safe while using as little mobile data as possible so you don't run up against bandwidth caps. It's free, and you can grab it at the link below.
Onavo Protect (Free) [iTunes App Store]