In reading different articles, comments and the like about the Droid X, it looks like some people are using their WiFi connection at home when using the phone and the 3G when out and about. Having just got involved with smartphones, first got the Motorola Droid 1 early June, and returned, now got Droid X, I'm not familiar with this practice. Is this something recommended? Does it conserve battery life? What's the difference, other than the obvious one is WiFi and one is 3G. Thanks for any help in advance!