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My iPhone 4 used to connect to my Wi-Fi network just fine, until one day, when it disconnected on its own and never found the SSID again. As was mentioned earlier, I found that the only way to remedy the situation was to go into Settings -> Reset Network Data. Upon doing so, the iPhone restarts, then I turned Wi-Fi on (it seems to be off by default), and my network showed up again. Connected just fine and now it's back to the way it was meant to be.
 
This worked

This fixed my wifi connection issues on my iphone.
Thanks for sharing. I disabled the 5.4ghz.


QUOTE=Petecomp1;11679000]Hi, I don't know if this will work in all cases but has for me so far. You will need to (a) know how to access your home router settings page and (b) be a bit familiar with router terminology. If not, my solution will be difficult to perform - try getting a geek friend to do it. Here's what has worked for me:
First, the important settings are : 2.4GHz vs 5GHz radio frequency; radio channel number; and A, B, G, and N (or mixed) wireless mode.
My brand-new iphone refused to connect to my brand-new Linksys E2000 router until I went into the router's setup page (http://192.168.1.1 from a web page) and found the "Wireless" tab on the Cisco/Linksys configuration pages. Once at the wireless page, there you will (usually) find settings for the items listed above. Here is what fixed my problem with my iPhone 3G: 2.4GHz; Mixed B & G mode; Channel 11. This particular router has a "auto" setting for channel. It would not connect until I changed this to "11".
Hope this helps someone out. Thanks for all the fine help I get from this forum!
Petecomp1[/QUOTE]
 
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