If you are not interested to find out the algorhythm used to pick the network but only want to view the list of remembered networks, there are at least three Cydia apps: "wifi passwords", "networkknowledge" and "networklist".
(The first has the advantage that it is a standalone app and does not install a mobilesubstrate library, while the others have the advantage that display the information right where you expect it in the wifi settings but at the cost of bulking the device with yet another mobilesubstrate library)
Bonus, this will also show the stored passwords in cleartext!
You will need to jailbreak the device first though, since access to the needed information require root privileges.
Thanks for that, I'll investigate. Mine is not a stock iPhone. – Damovisa – 2009-10-29T05:15:49.073