A few days ago, my phone started having the wi-fi start up automatically, I guess when it sensed thatan open wi-fi service was available. (I'm guessing this because it's been happening when I'm in places where such a service is provided.) This didn't used to happen. It began a couple of days before I upgraded to Gingerbread, and it has continued since then. The "Open Network" option under Wireless & Networks > Wi-Fi Settings isn't checked. What's going on?