Iphone cant recognize router, HELP!!!

I have a Wireless G Broadband router, the model number is wrt54g2. I also have iPhone 3G. I never had problems with my iPhone and I was always able to connect to wifi until today. For some reason my iphone wont recognize my router, it tells me “CANT CONNECT”. Please help! I’m certain that the configuration on my iPhone is correct, it works on other routers as long as I know the passwords.
However, the wifi can connect to my laptop. Does anyone have a clue as to what I should do to fix this problem?
Message Edited by mike_ny on 11-25-2009 06:24 PM

If you don't know the Encryption key, then you can login to the Router setup page of your Router and Find out the Security Key.
Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type 192.168.1.1 and press Enter...Leave Username blank & in Password use admin in lower case...
Click on the Wireless tab
Click on the Sub tab under Wireless > Wireless Security...
In these window you will find your security key and Security Mode. Using that security mode you can try to connect to your Wireless Network on your IPhone.

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