Cannot connect to password protected WiFi network

I received an iPhone for Christmas; at that time our home network was not encrypted and I had no trouble connecting to it. Since we protected it about a week ago, I have not been able to log into it on my iPhone (or iPod touch, for what it's worth). It picks up the network, and I know I am entering the correct password, but it will always say that it cannot connect. My sister has an older model iPhone and she has no troubles logging in to the network.
Any thoughts?

A couple of things come to mind:
- Password is case-sensitive. Have you checked uppercase and lowercase characters?
- Have you got mac-address protection (only allow certain mac-addresses to access the network). If so, enter the iPhones mac-address as an allowed one. How many devices do you allow on your wireless network? Maybe you've set the number of DHCP leases to a number which prevents your iphone from getting a mac-address?
Also, check the router-logs, try to determine exactly why you don't get access.
What is the OS-version of your iPhone?

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