Linksys router won't connect to iPhone?

My iPhone 3G won't connect to my linksys router. At first it connected then all of a sudden it just won't connect. The iPhone detects the linksys router, but sometimes just the IP address, but the rest is unknown. I don't think it's the phone because it has connected before, and this is my 2nd iPhone which has this problem. But it connects well with laptops. Just not Mac/iPhone.
Can you tell me how ti fix it. I have tried resetting the phone and the router, I don't know what else to do.
 
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