I kept seeing this on an iPhone 5S after an update to iOS 9.1: -
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New iCloud Terms and Conditions
To use iCloud on this iPhone you must accept the new Terms and Conditions.
However, each time I clicked on View Terms I merely got taken to the iCloud page in Settings, which made no difference.
I tried Turning It Off And On Again but to no avail.
I then Google'd about for a while, and found a post suggesting that I needed to go into Settings > Mail, Contacts, Calendars.
I then selected the iCloud mail account and ... saw a Terms and Conditions link.
I selected this, read the Ts & Cs, accepted them and .... we're now good to go :-)
Which is nice :-)