i still don't quite understand if i can unlock the 3g i have. i updated it thought itunes, so im sure the baseband has changed, but how can i still unlock it?
You can but will have to install a more complicated hack that will update your iphones baseband to the ipads version and you will most likelly lose your GPS functionality.
If you're up for it follow this: http://www.iclarified.com/entry/index.php?enid=12949
Limerain is a JB not an unlock hack.
Not sure if The Dev team will release a newer or better unlock but I think they're now working on the iphone 4 unlock.