Thanks Jester, i just did that and for some reason i dont see a new serial number just the one im sending back. It says my replacement shipped, wonder why i dont get a serial for the new phone. Again yours came in a reatial box or those replacement boxes ?
Log into the apple support site and you should see your shipped phone serial number.
https://supportprofile.apple.com/
Then go here to check detail on your phone (i.e. week made and which factory etc...)
http://www.chipmunk.nl/klantenservice/applemodel.html