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If your apps close on launch (that is, you tap on the app icon and you're immediately taken back to the home screen), try the following steps:

  1. Attempt to open and close the apps. Double-tap on your home button. If you have iOS 4 through 6.1.4, you will see a bar open up at the bottom of your screen with your recently-used apps in them. You can swipe from right to left to see more. Tap and hold on the icon of the app that is giving you trouble until it jiggles. Press the red circular button that appears in the upper left corner of this icon to close that app. Then try reopening it.
  2. If you have iOS 7, follow the same steps as above, except after double-tapping your home button, find the app icon with the preview of its open window above it. Then swipe upwards to close that app. Then try reopening it.
  3. If that didn't help, see if you can open the App Store and check for updates. If there is an update available for your app, try and get it. See if it helps.
  4. Power off and power your phone on again, for at least one minute. You should be doing this at least once a week if you use your phone lightly, and at least once every few days if you're a heavy user. To completely power your phone off, press and hold on the top (sleep/wake) button on your phone. Then, swipe your finger from left to right across the red "slide to power off" bar that appears on screen.
  5. If that doesn't help, attempt to restore your iPhone in iTunes. Note that doing so will ERASE YOUR iPHONE completely, so be sure all your information is saved first. You can try and restore from a backup and see if the issues persist, but if so, try restoring again and setting up the phone as new.
  6. If the issues are STILL persisting, bring your iPhone into your nearest Apple Store with a Genius Bar appointment (you can make one online; see the Related Links); they can run diagnostics and provide you with further assistance.
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Q: What do you do when your iPhone apps won't open?
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Related questions

Why wont your iPhone for let you open apps and how do you fix it?

because your stupid and u don't know how to spell four

Why won't my apps open on my iPhone 4?

The app that you are trying to open may not be compatible with your version of iPod Touch software.For example, if you have the iPod Touch 3.0 software, a lot of apps will not work with it because the apps are not compatible with that specific software.Some apps state in their summary that it isn't compatible with certain iPod Touch software versions.

How do you see what apps are open on an iPhone?

Double-click the home button.

How do you pass apps to your computer?

Connect your iPhone/Pod to your computer/laptop, open iTunes and sync your iPhone/Pod. The apps will then appear in your "applications" tab of iTunes.

How do you open an app from itunes to play on your computer?

you cannot play iPhone apps on your computer. And if you want to open games from your iTunes then you cannot either. iTunes is only for songs or games, videos, photos and apps for iPhone.

How do you install and uninstall apps on an apple watch?

You do it from your IPhone app for the watch. Open that on your phone and you can change faces, add apps, remove apps, download updates.

Is it bad to have a lot of apps in your iphone?

It is not bad in itself to have a lot of apps on your iPhone. Some negatives may be if many apps are open at the same time it may slow down your phone and having many apps may take up a lot of space.

How do you change iPad apps to iphone apps?

You buy the iPhone app

Who makes most of the apps for the iPhone?

apple create the apps on iPhone

How do you transfer games from your computer to the iPhone 4S?

All you have you do is connect it to the computer then just open itunes and drag the apps in to the side where it says something's iphone and tada there we go (doesnt work if there arent apps)

Can you use ipod and iPhone apps on iTunes?

no you cannot use ipod and iphone apps on itunes, but you can buy the apps on itunes and put them on your ipod and iphone

Can iPhone os 4 download iPad apps?

Although iPads can download apps made only for iPhone/iPod Touch, the iPhone can only download iPhone or iPhone/iPad apps. Apps made only for the iPad do not appear on the App Store. Luckily most of these apps have an iPhone counterpart such as Angry Birds (iPhone) and Angry Birds HD (iPad only).