What to Do When Your iPhone 5 Acts Up
Part of the iPhone 5 For Dummies Cheat Sheet
Most of the time, your iPhone behaves itself. But every so often it causes you problems. Here's a quick review of things you can try if your iPhone misbehaves.
Start with the first tip — later suggestions are more drastic.
Reset your network connection.
If you can't connect to web sites or Apple's App Store or other stores, tap the Settings icon on your Home screen, and then tap General→Reset→Reset Network Settings, which often cures network connectivity issues.
Restart your iPhone.
Press and hold down the sleep/wake button, and then slide the red slider to turn it off. Wait a few seconds. Press the sleep/wake button to turn the iPhone back on.
Reset and restart your iPhone.
Press and hold down the sleep/wake button and the Home button. Ignore the Slide to Power Off slider when it appears; continue to hold down both buttons until you see the Apple logo in the middle of the screen. When you see the Apple logo, release both buttons.
Reset the iPhone settings.
Tap the Settings icon on your Home screen, and then tap General→Reset→Reset All Settings. Resetting iPhone settings won't erase your data, but you'll probably have to change some settings afterwards.
Restore your iPhone.
Connect your iPhone to your computer as though you were about to sync. Then select the iPhone in the iTunes source list, and click the Restore button on the Summary tab.
This last suggestion erases all your data and media and resets all your settings.
Because your data and media (except photos you've taken as well as contacts, calendar events, and playlists you've created or modified since your last sync) still exist on your computer, you shouldn't lose anything. Your next sync will take longer, and you will have to reset any settings you've changed since you purchased your iPhone. But your media and data files shouldn't be affected.
One last thing: If you're using iCloud, photos you've taken as well as calendar events and new contacts you've added since your last sync should be "in the cloud" and should reappear after you restore. The only items in danger, at least in theory, are playlists you've created on your iPhone since your last sync. That said, it wouldn't hurt to let iTunes back up the contents of your iPhone before you click the Restore button.