I have an old IPhone 2G which now works fine, after activiation, jailbreaking and unlocking with customsn0w (a modified version of redsn0w). I would, however, like to use Skype on Wi-Fi on this Iphone. The trouble is that my iOS is 3.1.3, and Skype requires at least 4.x for downloads. Is it right that the latest Skype IPA for IPhone is compatible with iOS 3.x, and where can I get hold of this file?

For this to work, should I install whited00r RC v5.0 first or after the IPA file, or doesn't it matter?