Just upgraded to ISO8 and now my iphone 4s won't connect to home wifi - keeps telling me that the password is incorrect when it's not - help please.......

Please help me - I've just upgraded my Iphone 4s to ISO8 and now I can't connect to wifi - was at my friends yesterday - always use his wifi and even though the password was correct, it wouldn't accept it.  Came home and had the same problem.  I can't use my data plan as it wouldn't be enough so now it's chewing through it.........The only thing I did different was upgrade......... I'm not computer savy so please leave me step by step instruction on how to fix if you can.  I've tried rebooting etc and turning everything off - no luck.......

Have you tried resetting the network settings? Sometimes starting from scratch solves the issue and it is the simplest way I can think of that may solve your problem.
1. Go to Settings > General > Reset
2. Then select Reset Network Settings
3. Enter your password when it requests it
After the phone finishes the reset try adding your Wi-Fi again and see if that works. If not, I would back-up your phone to your computer, then reset the whole phone by following the same instructions above, but choosing Reset All Content and Settings at step two. Make sure you backup your phone first though! Otherwise you will lose all the stuff on your phone when you make this selection.
Good luck!

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