WIFI iPhone 3g not working

My wifi is not working and i have tried alot of stuff please help! It will look like its conected but not and the Router secton and the DNS does not have anything there. like i said please help!
IOS 4.2.1
Baseband 6.15.00

1. reset network settings if you havent already, settings>general>reset>reset network settings.
2. Unplug your router for about 30 seconds, plug back in, give a minute or 2 to fully boot back up and try connecting again.

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Well, just for future reference, any time you do an iOS upgrade, it is a good idea to back up your device just prior to doing the download. You can back it up to iCloud or to iTunes. Personally, I prefer to back it up to iTunes, and then to do the download via iTunes as well. Doing a Wifi download can, by the very nature of the OTA environment, run into more issues than a hard-wired one via iTunes.
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Some things to try first:
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~~~~~~~~~~~~~~~~~~~~~~~~~
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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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..... ty for the link, however this is the first result googling the issue..... of course it did not work....
it is really unbelivable that plenty 4s devices suffered the wifi troubleshooting just after upgrading to ios7, and finally.... i should burn wifi and bluthoot, and another hardware problems should cause % battery value is disappeared....
all this in one shot....
firmaware is not well working or is somebody bombing our devices to force us to switch to newest?

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Hi there bananas321,
You may want to try force closing all open apps and resetting the device as an initial troubleshooting step. Take a look at the articles below for more information.
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http://support.apple.com/kb/ht5137
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I have no idea what may have caused your MacBook to stop working, but from your description it kind of sounds like it may have started before you ran Software Update and installed the new Apps. Just the general slow feeling and bugginess is what tips me off. You said that you weren't sure if you had closed all open windows, that doesn't matter if the computer restarts itself. It automatically closes all other open applications when restarting.
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As a side note, the proper place for this topic would probably in the MacBook forums, not iTunes since there is no evidence that iTunes started the issue.

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