iphone app run on background?

Question

is it any possibilities iphone app run on background, because my task is to retrieve wifi info and send it to the server about ssid & rssi, how this can be done,

Answer 1

It can be done on jailbroken iphones, with backgrounder app. http://code.google.com/p/iphone-backgrounder/

You might also be able to hack it by sending push notifications and checking for wifi when responding to the notifications ... kind of server-to-phone polling.

I doubt apple would approve an app that did either of these though.