After updating my iPhone 5 to iOS 8.0.2 my safari, mail and calendar won't open. How do I rectify this issue?

I recently updated my iPhone 5 to the iOS8.0.2 version and since then I cannot access my safari, my mail and my calendar icon is blank.  Every time I touch the icon it just blinks, the phone screen goes white and then it reverts back to the main screen.  I have used 8.9 GB of storage and I have 3.8GB available. 
I have powered my iPhone down a few times and restarted it and it doesn't make a difference.
Please help.
Thank you. 

First, reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again. You will not lose data by resetting, but it can cure some glitches after installing new software.
If this does not work, set it up as new device, explained in this article:
iOS: How to back up your data and set up your device as a new device
If this does not work after restoring from the backup, try again, this time without using the backup, to make sure that this is not software related.

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