Do you know: How to save storage space in your IPhone
If you are using your Iphone to take pictures and you are concerned that you will go out of storage space, with iOS 8 you can optimize you photos.
iOS 8 gives you the ability to save optimized pictures and videos in your iPhone.
Here is how it works:
#1 Open Settings
#2 Choose Photos & Camera
#3 All the process goes through iCloud Photo Library, which functions only if you have active iCloud Drive
#4 Activate Optimize iPhone Storage