Also, here's news on Apple storing detailed call logs and iMessage information for as long as 4 months duration via iCloud (https://theintercept.com/2016/11/17/iphones-secretly-send-call-history-to-apple-security-firm-says/):
"The syncing of iCloud call logs would not be the first time Apple has been found collecting data secretly. A few months ago, The Intercept reported about similar activity occurring with iMessage logs.
Chris Soghoian, chief technologist for the American Civil Liberties Union, said he’s not surprised that Apple is collecting the information.
“It’s arguably not even the worst thing about iCloud,” he told The Intercept. “The fact that iCloud backs up what would otherwise be end-to-end encrypted iMessages is far worse in my mind. There are other ways the government can obtain [call logs]. But without the backup of iMessages, there may be no other way for them to get those messages.”
Still, he said it’s further proof that “iCloud really is the Achilles heel of the privacy of the iPhone platform. The two biggest privacy problems associated with iCloud don’t have check boxes [for users to opt out], nor do they require that you opt in either.”"