Glad to hear about the successful reinstatement of your Wi-Fi connection. Next time you have an issue you might like to consider the following procedure.
Its always a good idea with any upgrade that you forget the network on the iPhone switch off Wi-Fi then power off the iPhone 'menu and power button held on together until the Apple logo disappears and the phone is switched off.
Then power off the Router+Modem or Router and Modem. If you have a dynamic IP address on the Internet connection you may have to leave the router off for about 5 minutes so that the IP Lease is released/revoked.
Sometimes it might be necessary to also forget the iPhone with in the Routers settings in other words release the IP lease issued to the iPhone. You can of course make the IP address of the iPhone permanent should you so choose.
Another issue that needs to be check is which channel you have selected the default is usually '6' which you may be sharing with other users. You may be able to improve your Wi-Fi performance by choosing another channel.
There is a piece of software 'Free or for a Donation' that will allow you to detect Wi-Fi services in close proximity and what channels they are using. I have no association with this publisher so posting their address in this forum is not an endorsement
http://www.vistumbler.net/
Then you power up the Router/Modem check that you have Internet connectivity from a Desktop and then power up the iPhone switch on Wi-Fi and reconnect to the network. Don't forget that you will need to have a record of the encryption password used by the router usually WPA.
Message was edited by: adnixon