My iPhone 3Gs would not connect to Wi-Fi

Hello,
My iPhone 3Gs will not connect to Wi-Fi, it results in a message that states, "unable to join the network". The IP address, Subnet Mask, Router, and DNS is blank- which I am guessing the router do not give my iPhone a valid address anymore. When I first installed the router, it gave my iPhone an address and worked excellent with my other wireless items. My other wireless items still are connecting to the internet but not the iPhone.  
I have tried:
- restarting the router (the firmware is updated)
- resetting my network settings on the iPhone
- turned my "Airplane Mode" on and off
- syncing the iPhone with my computer to factory settings (version iOS 5.0.1)
- I have tried changing the security to wep to wpa to wpa2
Thank You

Help anyone

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