Yes.<p>getcloak.com is a combination app and subscription VPN service that makes it easy. You can either switch it on, or set it to always on. You can decide which wi-fi networks (or cellular) to &quot;trust&quot; (exception to always-on).<p>The VPN, including always-on functionality, is implemented by iOS. The Cloak app merely configures it via API (or via configuration profiles prior to iOS 9).