Backing up iOS
Using iCloud, tap the Settings app, then scroll down a bit and tap iCloud. Make sure your account is connected; if not, log in. Now, scroll down to and tap Storage & Backup, then either make sure the automatic iCloud Backup is enabled, or scroll down a little bit and tap the Back Up Now button.
To back up through iTunes, connect your phone to your computer and launch iTunes. Then, open the File menu, then navigate to Devices, and choose the Back up option.
How to download iOS 7
First, make sure everything on your iDevice is up-to-date by checking the Updates tab in the App Store app.
The two primary, official ways to upgrade to iOS 7 is through an over-the-air update, or through iTunes. Over-the-air is the most convenient way to perform the update — just make sure your phone has a reliable internet connection, and plug it into a power source just in case the battery drains. Normally, your phone receives an automatic notification, and you can tap it to go to the update screen, wherein you simply tap the update button to begin the process. If you don’t trust the automatic notification, you can simply tap the Settings app on your iPhone, then tap General, then Software Update. That’ll force your phone to check for the update. If it’s available, simply tap the update button and off you go.
How to get iOS 7 with iTunes
Again, make sure everyone on your iDevice is up-to-date by checking the Updates tab in the App Store app.
If you’d prefer to go the iTunes route, connect your iDevice to your computer, launch iTunes, and navigate to the Devices section. Then, select the device you wish to update and choose “Check for Update”. If the update is available, you can choose to download the iOS 7 update solo, or download and install the update automatically.
The main reason why we’d recommend going the iTunes route is just in case you don’t have too much space on your iPhone and you aren’t sure if iOS 7 will fit.
After you update, sit back, relax, and get ready for an operating system that looks different enough to be new, but similar enough to feel like a different OS but wearing a disguise.