What's that exclamation mark in iPhone Photo Library?
I turned on the "iCloud Photo Library" thing when I updated the iOS 9.1, but now most of my photos are in low resolution and a exclamation mark appears inside a circle. I've search and its not Wi-Fi problem nor iCloud storage issues… Help! 
In Photos a circle with an exclamation point indicates, that the original image file needs downloading from iCloud. Turn your internet on. To Improve Applock compatibility, You must also install Leo Privacy Guard in your smart phone, with Stylish themes
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