IPhone 4S Not Connecting to Wi-Fi Network?

Starting today my iPhone 4S will not conect to my Wi-Fi. I've owned the phone since its 2011 fall release and have never had a Wi-Fi connection problem. Here are some troubleshooting ideas I have tried (all failed):

Turn Power On/Off
Reset Network Settings
Reset router and modem
Forget Network

It is not the network's fault since my mac and iPad are successfully connected with no problems. Any more ideas would be great!

iPhone 4S, iOS 5.1.1, Black

Try pluging it in 2 your computer