IPhone Wi-Fi Network Problem?

My home Wi-Fi network was working on my iPhone 4, just 2 weeks ago and now it's not working on my iPhone. I thought there was just something wrong with my Router, so I reset it, but it didn't help. The weird thing is that my home Wi-Fi is working on my 2 laptops, but still not my iPhone. When I click on my Wi-Fi network and it usually pops up with a prompt to enter my password, but instead now it just immediately says "Unable To Join Wi-Fi Network"

Any Help Will Be Greatly Appreciated!

After multiple attempts at trying to connect the router and the ipod get confused. Do this, in this order, and when I say wait a minute or two minutes I mean a full minute or two. I don't mean 10 seconds that you think is a minute. Wait at least as long as I suggest. The timing is important for things to reset themselves.

Turn off your ipod all the way. This means holding the button on the top down for 10-15 seconds and then sliding when it says slide to power off. Leave it off.

Go to your router and turn it off. Often this requires unplugging it. Don't worry. It will reconnect itself to your cable and all your other devices will reconnect themselves too. What this does is forces the router to forget what it knows about the unsuccessful attempts to connect to it. Leave it off for a minute. Turn it back on. Wait two minutes. This will reestablish it and reconnect your other devices again.

Now back to your ipod. Turn it on. Wait a bit for it to turn on. It's rebooting itself and will now have a clean shot at connecting to the router. When it's on tap network connections and select your router. Enter the password. Wait two minutes for it to fully connect itself before you start trying to access anything. Tap the connection name and make sure the fields on the next screen are populated. If they are you're connected.

These steps clear up 99% of all connection problems. From then on your ipod will connect itself.