My iphone has stopped working? - 2

I got the iphone 4 last year, and since last week everything keeps crashing, like when I try to delete pics it crashes, when I open safari it crashes, it won't let me update my apps or get the new ios 7 and when i screenshotted pics the other day it only showed a grey screen, its like the whole phone has stopped working, what's wrong with it?
apple sucks

Try restoring your phone.
1. Connect your device to your computer.
2. Select your iPhone when it appears in iTunes. Select the Summary tab, and click the Restore button.
3. After restoring try updating to new ios7

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