http://wccftech.com/ios-111-public-beta-2/

Those enrolled in the Apple Beta Software Program will be pleased to learn that they can now download iOS 11 Public Beta 2 right away.

Apple tests out its software extensively before pushing it out to everyone, that’s why it has an initiative called the ‘Beta Software Program.’ This means that you do not have to spend $99 on an annual basis just to try out beta software from the Cupertino company. Signing up is as easy as heading over to beta.apple.com, logging in with your Apple ID and enrolling your device on which you wish to download the public beta software.