When I bought my LG Optimus Me, I had a problem: whenever I opened Facebook, Market, or any other app which uses the network, it told me it couldn't estabilish a network connection.
I searched and was told to remove my SIM card and make a Google account using Wi-Fi. That worked, but those applications now only work when using Wi-Fi, when I'm using 3G they don't work. I do have 3G enabled in my phone settings. Any clue?