WIFI not working anymore

I got the iphone about 5 days ago and i was using it with my school wireless network. I had to register my iphone's MAC address through school and typed in WEP on the iphone and the wifi was working fine. But the internet has stopped working on the iphone since yesterday.
although internet is connected through wifi, when i open safari, it says "safari can't open the page because it could not connect to the server." i re registered the mac address and re typed in the password but the same thing is happening. what is wrong???

See if the following steps help.
1. On the iPhone perform a Restart
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
Now retest your connection to the WEP Network
2. If that does not work, Toggle Airplane mode on and off, This can be done by going to Settings, Airplane Mode, Turn on for 30 seconds then turn off, Retest WiFi
3. Go to your WiFi Network, you should have padlock, Tap on the Blue circle, and see if you get an IP address and a Router Address. If you do not then you are not communicating with the Wireless Network even though your connecting.
In most cases this is a Wireless Security Issue. Something the school changed or maybe an update on your iPhone.

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[ 2.979833] usb 3-1: firmware not found.
Do I need any additional firmware?
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WIFI not working anymore

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