You can set your mobile phone to automatically remove apps you haven't used for a long time to free up phone memory. All app settings and data are saved and will be restored when you reinstall the app from App Store.
Step 1 of 4
Find "iTunes & App Store"
Tap Settings.
Step 2 of 4
Find "iTunes & App Store"
Tap iTunes & App Store.
Step 3 of 4
Turn Offload Unused Apps on or off
Tap the indicator next to "Offload Unused Apps" to turn the function on or off.