Apple launched iSO 11 last night. Its public beta version is available after few days but its developer beta version is available to instll from now. Use the following method to install it.
Install this profile after clicking this link using safari browser.
https://beta.applebetas.co/ios
Then check your phones update option in about section, you will able to see latest updates.
The most awaited option so far i expected is Data On Off switch. Its finaly here.
Use this version only if you know the issues of a beta software its not fully stable.
Dont install on iPhone5,5s i personaly see errors reported by my friends.