in iOS 4.x, there were APIs about my requirement, But it seems changed into private in 5.x, And It seems to removed in 6.x. (Actually it seems can't be called in sandbox)
Getting SSID list for 802.11 is very essential idea for our new project.
I believe that there is no solution for this. the reason is:
Even user disabled location service, an App which accesses SSID list(actually BSSID) can infer location of user by using skyhook or something similar solution.
This information is not confirmed by Apple, But I'm pretty sure about it.