I updated my software to iOS6 and now my phone won't automatically join known wifi networks even though I have it on.  It goes back to 3G every so often when I'm at home instead of using wifi, and each time I ask to join it asks for my wifi password

I updated my software to iOS6 and now my phone won't automatically join known wifi networks even though I have it on.  It goes back to 3G every so often when I'm at home instead of using wifi, and each time I ask to join it asks for my wifi password

Try this for your home Wi-Fi:
On your iPhone, Settings > Wi-Fi > select your home network > "forget this network"
Power down (unplug) your wireless router
Restart your iPhone
Plug in your router
Re-join that network
I don't know if this simple technique will fix it for good but try it. There is a long thread about this problem here: iOS 6 WiFi Disabled

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