iOS 10.3 may have re-enabled services for some (via Mac Rumors)

This has been fixed and may have effected only a small number of people, but it's good to have a quick check, if you have installed the iOS 10.3 update. (NOTE: Updated 10.3.1 users are not effected, according to Mac Rumors article.)

For reference and further reading:

How-To: iCloud Keychain on iPhone and iPad (via iMore)

Passwords are everywhere and, for security, we don't want to use the same password for everything. iMore has created a guide for how to use Apple's iCloud Keychain on your mobile devices. (There is also a link to other password managers, if you'd like to check those out too.)  Find out how to get iCloud keychain enabled here.

For reference and further reading: