That question occured to me when I saw the
WIFI_MODE_FULL API documentation:
Wi-Fi will be kept active, and will behave normally, i.e., it will attempt to automatically establish a connection to a remembered access point that is within range, and will do periodic scans if there are remembered access points but none are in range.
However, in my recent experience, my Nexus One never connects automatically to my remembered networks (It just displays the notification that some open networks are available). However the programming API suggests that it should be able to connect automatically - how can I configure my phone to do that?
I have a Nexus One with Android 2.2.
Edit: Thank you for your comments. After checking, I have found that my N1 does connect automatically to the remembered networks - but after I have left it to sleep, it is never connected (even though I set the Wifi sleep policy to "Never") - and when I open the Wireless configuration panel, I find that my remembered networks are "disabled". How can I prevent that?