Does iPhone4 (Verizon) automatically DISABLE 3G when in WiFi?

I know that when in WiFi, the iPhone4 will prefer / use the WiFi network instead of the 3G network. However, my question is whether the iPhone automatically disables the 3G radio when in WiFi. I have unlimited 3G data, but WiFi is faster and is also better on the battery, so when I am in WiFi I prefer to use it instead of 3G. I want 3G disabled while I am in WiFi to save battery. Of course, I can manually go in, enable WiFi and disable 3G, but I have noticed that when my iPhone connects to WiFi, the WiFi antenna symbol replaces the 3G symbol next to the Verizon bars. This makes me wonder if the iPhone is actually turning off 3G automatically when it connects to WiFi versus just preferring WiFi but still having the 3G radio on.
Thanks!

Perhaps I didn't phrase the question exactly right. I can go into Settings and disable 3G (actually on the Vz iPhone it is Disable Cellular Data), which leaves voice connectivity but no ablity to get 3G data, and helps preserve battery. When I am in WiFi, does the iPhone automatically disable Cellular Data or does this still have to done manually? Thanks!

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http://money.cnn.com/2014/03/20/technology/security/drone-phone/
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