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Q: I can't update my iPhone. Says update available but icon bar is not highlighted
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Feb 8, 2015 3:38 AMby Japib,Update the iOS software on your iPhone, iPad, and iPod touch - Apple Support
It clearly states:
- Plug in your device to a power source.
If you have some free space, but not enough to update over the air, you can either update using iTunes or delete content manually from your device. Whether you use iTunes or update over the air, you'll have the same amount of free space on your device after you update.
VPN or proxy connections might prevent your device from contacting the iOS update servers.
