ok, so at this point, we can't pull dhcp. I would check the ssid and wep keys to make sure they are correct. Can you web into the bridge and determine if the phone is associated? (should be a page in there somewhere that shows all the associated devices)
It might be easiest to strip off all security for troubleshooting, so all you have to set is the ssid. I think the phone is set to ssid 'cisco' by default - if you're having problems changing the phone settings, maybe you can change the bridge's ssid to 'cisco.' (on the phone, I remember having to hit 'apply' for like, every setting to get them to take - was kinda wierd)
It might also be worthwhile to try using a laptop or something to associate & just pull dhcp, just for troubleshooting purposes.