My iPhone 4 runs iOS 5.1.1.
When I go to settings > iCloud, the Photostream option is not available. I've tried to restore my phone, but the option is still not available.
How can I activate this setting when it's missing from the preference?
Just looked a little closer at my settings.... Settings -> General -> Profiles -> [Work Profile] -> More Details -> Disable Documents in the Cloud, iCloud backup, Photo Stream.
There's my answer, my company supplied configuration that was loaded on the phone limits this option.
C'est la vie...
Photos are no longer in the CAMERA. They are in the Photos. (the blue background with the flower).