My iPhone 4 is not connecting to a Wi-Fi signal?

My iPhone 4 is not connecting to a Wi-Fi signal it connects to others but not a certain one. I know its not the Wi-Fi's fault because my roommate's iPhone 4 connects perfectly

Oh no. Tour internet may be down. Contact your provider

Some iPhones have a problem with higher numbered Wi-Fi channels. Change the channel on the Wi-Fi box you're having problems with to a channel number of 6 or lower. That'll do it.

You don't know enough to know it isn't the Wi-Fi signal. It could easily be set to only accept certain mac addresses.

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