The wireless already automatically connects doesn't it?

I guess what I see is even when I'm showing connected in WiFi listing, it is still using the cellular data connection instead of the wireless connection. I'm with USCC so it's only 1X and almost any WiFi is faster.

If i go to start>settings>connections>connections>advanced>se lect networks
and change the top one to the wifi connection instead of the "My ISP" manually it works perfect, but it doesn't switch back to the "My ISP" when a WiFi connection is terminated or is out of range. I'm looking for something to automatically switch this setting for me when a wifi connection is 'connected' and switch to "My ISP" when they are all disconnected.