I can connect through wired connection but not wireless

I can connect my xbox with the ethernet cable, but i am unable to get it to connect wireless. My laptop & phone are able to connect, but i'm outta of steps under "suggestions on xbox help" I did try the steps such as resetting network configurations, i tried unplugging the router, i know my password is correct. i tried putting in the ip #'s. the xbox is not the only thing that won't connect wireless, neither will the ipod or kobo. it has been suggested that my router may be set for only a certain # of connections???? i have a netgear router if that helps at all, any suggestions would be appreciated, asI am at a block...... thanks