You connect your Apple iPhone or iPad to your computer and open iTunes to sync some new music or to update the iOS version. On the storage row, you find that there’s an awful amount of “Other” storage, maybe even a bit more than 1 GB or even worse !What is this “Other”? Other contains files that iTunes cannot categorise such as contacts, messages and emails. That’s not all. It can also contain corrupted files.
I am going to share how to reduce this “Other” storage and hopefully reclaim some of the lost storage in your iPhone or iPad. It is not necessary to restore your iOS device by downloading the most recent version of iOS. However, try it if the procedure given below fails.
- Connect your iOS device to the computer using the lightning connector (or USB cable for models before iPhone 5) and open iTunes
- Click on the “Device” icon (The one which looks like a phone) in iTunes.
- In order to avoid losing of your precious data that is stored in your iOS device, back it up to your computer by selecting “This computer” radio button under “Backups” and click on “Back Up Now”
- Disconnect your iOS device from the computer.
- In your iOS device, tap on Settings>General>Reset>Erase All Content and Settings and tap on “Erase iPhone” or “Erase iPad”. Wait for the iOS device to restart.
- When the Set Up screen gets displayed on your iOS device, connect your iOS device to the computer using the lightning connector (or USB cable) and open iTunes.
- Follow the steps given in this link to restore your iOS device : Restore your device from an iCloud or iTunes backup.
Notice that the “Other” storage has been significantly reduced and your lost free storage in your iOS device has been reclaimed.
Hope this helps.
 Stack Exchange. 2015. Ask Different. [ONLINE] Available at: http://i.stack.imgur.com/9hEZT.jpg. [Accessed 19 May 2016].