How to enable iCloud keychain on iPhone and ipad

ICloud keychain is an excellent feature in osx mavericks and ios7.To enable iCloud keychain on iPhone and ipad:

class=”alert alert-success”>If you have iOS < 7.0.3

Install iOS 7.0.3 [preferences > general > software update]
As part of the iOS 7.0.3 setup you will be asked to add a passcode if you don’t already have one.
You will then be asked if you want to approve from another device, use iCloud security code or ‘don’t restore passwords’
Click ‘approve with another device’
You will get a notification on your mac telling you that your iPhone or iPad wants to use your iCloud keychain.
You are then prompted for your iCloud username and password
The iPhone will then activate on its own.

If you already have iOS 7.0.3 and skipped the setup questions