IPhone 5 - Unable to join the [Wi-Fi] network?

Please help!
I'm very reliant on my iPhone for internet access throughout the day and for some reason, out of the blue, my home Wi-Fi is refusing to connect with my iPhone 5. The Wi-Fi worked at school earlier today without any problems but when I got home and tried to connect to our Wi-Fi here the message "Unable to join the network" continues to pop up.
I've tried the airplane mode trick (turn on to airplane mode, turn phone off, turn phone back on, and then turn off airplane mode), resetting the network settings, turning my Wi-Fi router off and back on, and the obvious clicking the Wi-Fi connection on and off from my iPhone.
I'm tempted to call AT&T or Apple Support but from what I've read online they haven't helped others with this same problem. Our home Wi-Fi works just fine on my laptop and our main desktop computer.

What can I do to get the Wi-Fi back on my iPhone?

Try this go to the page where it list available Wi-Fi's choose other then fill out your Wi-Fi setting.

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