Most of the time we wanted to save our remaining data but we don't know that sometimes even if we are not using the apps which is open, it still consumes our mobile data so better to turn it on "Stop Internet Usage" in our iPhone.
Tutorial on How to Stop Internet Usage of Applications on iOS1. Tap Settings.
2. Tap Cellular/Mobile data.
3. Tap any Application switch to stop Internet usage.
4. Now application internet usage is closed.
How to Turn off iTunes and App Store
1. Tap Settings.2. Tap iTunes & Apps Store.
3. Tap Music switch to make it disable.
4. Tap Apps switch to make it disable.
5. Tap Books & Audiobooks switch to make it disable.
6. Tap Updates switch to make it disable.
7. Now iTunes & App stores is turned off.
How to On Air Drop
1. Drag Up Notification bar.2. Tap and Hold Basic networking options.
3. Tap Air Drop.
4. Tap Everyone.
5. Now Airdrop is enabled.