MacBook Pro can connect via Airport but not iPhone or iBook G4.

Anyone have any ideas? My Macbook Pro can connect to my Airport (v.7.3.1, 802.11n) but not my iPhone or iBook or a Windows Computer or WiFi Blackberry.
The connection is strong and detectable by the ibook but "unable to connect".
Somethings up with the settings but not sure what.
Any ideas?
HELP!
thanks
--K

I've tried Channel 1,2,3,4,5 (still need to try the others)
Secured or unsecured the only wireless connection that works is my MacBookPro.
I get the message "unable to join network..." The connection is very strong.

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