My mother didn't upgrade her phone to iOS 8, and still hasn't.
She's not tech savy, she doesn't read internet articles, and she's too busy with a hectic life to even see the news.
What stopped her??? She plugged in her iPhone to iTunes on Windows, and it gave her a message saying she didn't have enough space to install iOS 8.x.
She told me about it, and I asked her if she had attempted to do it through just the phone, or if she had actually plugged it into the computer and done it through iTunes.
She said she plugged it in, and tried with iTunes.
I told her, that it shouldn't be a problem then. You only run out of space to upgrade if you do it without the computer. She told me that iTunes told her she didn't have enough space.
So, I asked my brother who was right there with her, and he told me he watched her do it, and that it did in fact give her that error.
So, while I haven't had that issue doing it with a Mac and iTunes, she did experience that issue.
That is why she's not on iOS 8.x... so, whether it's an iTunes glitch, a size issue, or whatever, the end result, is that it is not likely that the majority have obtained because of stories. Many people go through their lives blind to what other iPhone users say, and still don't upgrade.
In fact, it was me who got her to upgrade to 7.x in the first place, because she hadn't even heard about it until about a month or so before iOS 8.0 was released.
It's not an iTunes glitch ... she doesn't have enough free space. She'll need to backup everything via iTunes ... do a clean restore, which will wipe the phone and allow iOS 8 to be installed ... then restore from the backup you made prior to upgrading to iOS 8.
No one in my extended family has moved to iOS8 due to them not having a computer, and out of space. They ask me what to do with their photos. What can I say? Delete them.
Obviously, they will not.
That's some pretty awful advice. They can back them up via iPhoto or if they're on Windows they can back them up to Picasa. Or they can back them up to Dropbox or many of the other free services for backing up files online. Or they can back up with iTunes. This is a list of things that iTunes backs up:
• Photos (photos, screenshots, images saved, and videos taken) and Saved Photos (in devices without a camera).
• Contacts* and Contact Favorites. (You should regularly sync your contacts to a computer or cloud service, such as iCloud.)
• Health (only if you have an encrypted backup).
• Calendar accounts, events, and subscribed calendars.
• Safari bookmarks, cookies, history, offline data, and currently open pages.
• Autofill for webpages.
• Offline web app cache/database.
• Notes.
• Mail accounts. (Mail messages aren't backed up.)
• Microsoft Exchange account configurations.
• Call history.
• Messages (iMessage and carrier SMS or MMS pictures and videos).
• Voicemail token. (This isn't the voicemail password, but it is used for validation when connecting. This is only restored to a phone with the same phone number on the SIM card.)
• Voice memos.
• Network settings (saved Wi-Fi hotspots, VPN settings, and network preferences).
• Keychain. (Includes email account passwords, Wi-Fi passwords, and passwords you enter into websites and some apps.)
• If you encrypt the backup, you can transfer the keychain information to a new device. With an unencrypted backup, you can restore the keychain only to the same iOS device. If you're restoring to a new device with an unencrypted backup, you'll need to enter these passwords again.
• App Store app data. (Minus the app itself, its tmp, and Caches folder.)
• App settings, preferences, and data, including documents. (PDFs downloaded directly to iBooks on an iOS device are not included in the backup. To back these up, go to File > Transfer Purchases.)
• In-app purchases.
• Game Center account.
• Wallpapers.
• Location service preferences for apps and websites you've allowed to use your location.
• Home screen arrangement.
• Installed profiles.
• When you restore a backup to a different device, installed configuration profiles,*such as accounts, restrictions, or anything that can be specified through an installed profile, aren't restored. Any accounts or settings that aren't associated with an installed profile will be restored.
• Map bookmarks, recent searches, and the current location displayed in Maps.
• Nike + iPod saved workouts and settings.
• Paired Bluetooth devices (which you can only use if restored to the same phone that did the backup).
• Keyboard shortcuts and saved suggestion corrections.
• Trusted hosts that have certificates that can't be verified.
• Web clips.
*Your contacts are part of the backup to preserve recent calls and favorites lists. To avoid any potential contact data loss, back up your contacts to a supported personal information manager (PIM) or another cloud-based service (such as Gmail or Microsoft Exchange). You can also make a copy of contacts that are in iCloud. Learn about backups in iCloud.*
http://support.apple.com/en-us/HT4946
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