My iPhone 4 won't connect to wifi networks?

I've tried resetting my network settings many times and it still doesnt seem to work. I then tried resetting all settings, still nothing has changed.
It usually turns blue with a tick once it's connected properly but now the wifi signal strength turns blue but the actual wifi router name doesn't and the blue tick doesnt appear.
What else could I do now? Please help Also I'm trying to download iOS 7 so the software it new but obvioulsy without a wifi connection, it's not possible.

Try updating your phone through iTunes on your computer. You will need to make sure you have iTunes 11.1 installed

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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
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Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
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How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

My iphone 4s won't detect any wifi networks.

Hi
My iPhone 4s won't detect any wireless networks. It was working fine until last night when the connection dropped int he middle of me watching a programme. At first I thought it was our router, but I reset that about 5 times, and all other devices are working fine on it. The phone won't detect any other networks either - if I ask to join a network it comes up with the message "could not scan for wireless networks". I have tried resetting the network settings as suggested on the support page, but it hasn't worked. Can anybody help? Thank you.

If no change after resetting network settings on the iPhone, try restoring the iPhone with iTunes as a new iPhone or not from the backup.
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