How to fix iphone 4s wifi not working

How to fix wifi not working on iphone 4s after it is updated to ios 7 ?
Here is what fixed my wife's phone after several weeks of no wifi. We had removed the Sims card and transferred to another phone which was running ios 6. My son was visiting and said Apple had come out with an update a few days ago and he decided to attempt to install it on the 4s phone that had no wifi and no cellular because the sims card was removed. He tapped the icon to update the new ios version and received the message to the effect that No WiFi available would you like to search for available networks. He selected yes and immediately the wifi came on and has been working now for two days. Also we never installed the update to the new ios.
My advice is to remove your sims card like we did or trun off your cellular and attempt the update to see if you get the message to search for available networks and then of course choose yes. Go figure. Hope this works for you.

Read this http://support.apple.com/kb/ts1398

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