How to connect an apple iphone to a belkin wireless router?

I have an apple iphone 4s that can't be connected to the wireless router. We have tried:
resetting the network key
reset the router
disabled the security

and still nothing any suggestions or a step by step this is annoying that other devices connect to the wireless but my iphone can't

Make sure your wireless is sending out a "G" signal. An iPhone can pick up on a wireless B or N signal, but it doesn't work the best for first connecting it.

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