I have looked all over and can't figure this out. If I visit a particular website with my Droid X using a particular wifi connection and then revisit the same site sometime later on a different wifi connection, the site views me as a unique visitor each time. I assume this is because the different wifi connections have unique IP addresses (and I have my browsers set to refuse and clear cookies when I exit a session). Now if I use the same set-up (no cookies etc) with wifi disabled and visit the site via the 3G network, the site does not view me as a unique visitor. I have changed IP addresses by turning on and off airplane mode and verify that a new IP address is in use and the site still recognizes me as having been there and remembers my settings/selections on the site. If there is no cookie to identify me, and the IP address is different, I can only conclude that there is some other piece of information identifying me as having gone to the site previously. Is this correct? and if so does anyone know what information that is? It isn't a problem, I am just really curious about the difference in the behavior of the two networks.