iOS 8, Apple's newest software operating system for iPhone, iPad, iPad mini and iPod touch, launched on the evening of 17 September, bringing a plethora of great new features.
In order to install iOS 8 on your iPhone, iPad or iPod Touch, you’ll need free space up to 5.8 gigabytes depending on the phone model.
Instead of installing Over-the-Air, iPhone and iPad users with limited storage space will need to install via iTunes. iTunes doesn’t require users to have free space to download. Installing iOS 8 over iTunes is far less convenient but it’s the only way you’re going to be able to install iOS 8 without deleting apps, music, and other files.
To install the iOS 8 with iTunes, plug the iPhone or iPad into the proper computer and sync. Users will be prompted to make a backup, something that is key before installing a large update like iOS 8, and users will also be required to enter the passcode if one is active. Once those are taken care of, the installation process will begin.