iPhone 4 apps won't open?

Here are a few things you can try.

Hold the home button and power button on your device until you see the apple logo - once phone reboots test.

If that didnt fix it try this.

Go to settings>general>reset>reset all settings - follow the setup assistant - test again.

If that didnt work try this

Connect to computer

Click on iPhone under devices.

Click on Apps tab

Uncheck Sync apps - click remove - click apply

Recheck sync apps - Recheck all apps desired- apply

If that didnt work then your down to the restore, and setup as new.

Follow http://support.apple.com/kb/ht1414

Once the restore is complete do not restore from backup - choose setup as new.

Make sure to backup your contacts/photos/Calendars/ before doing this since this will erase everything off of the device

Download a free app from the App Store. Once it downloads, your other apps should work properly again.

THIS WORKS... Wish I knew why. Probably resets some 1s and 0s. Thank you.

I tried all the suggestions in here, INCLUDING resetting my settings. irritating, and useless. Then i came across Meg's. It works! AND, its the easiest one here.

Just go to the app store, and download any free app. Doesn't matter which one. You can delete it again later. But, for whatever reason, it works. PLEASE save yourself the headache and try this one first.

Wow, as a developer this is fairly disconcerting. Meg's right on, just download some random free app and you're good to go!

Nothing is working I downloaded 3 free apps and it doesn't work

Thank you Meg St._Clair

Your solution worked for me.

Thanks Meg St._Clair, worked like a charm.

Also wanted to thank Meg!

WORKED!!!!!!!!!!!! thank you! huge life saver i tried everything and this was the alst thing i came upon i was just gona give up and take it in if this didnt work

The thread that keeps on giving..... Glad it helped!

Yes indeed, Meg. Just happened on my wife's iphone 4. I never would have guessed it might be that simple. Thanks for the tip!

I'm glad it's still helping!

I traded in my iPhone 4 for the iPhone 5s today and synced my phone with iTunes on my computer to reload apps. They all appeared to load completely but most would not open...the initial screen would show up for half a second and go away. A few did open. I tried your idea of downloading one free app but it did not work. What did work was going to the App Store and searching for an app that wouldn't open. The button said "open" (not install, so I knew I did have that app already on my phone). I clicked "open" and then the app appeared to load all over again, which was odd, but it did work. Hope that helps someone with a similar issue.