The WiFi will turn itself off when the screen locks in WP8 pre-Portico. However, in phones running Portico you have the option to keep WiFi active under screen lock.
My Nokia Lumia 920 has suddenly stopped working. It's just displaying 'Nokia' which it does while we start up the phone. Can anyone help me in solving this issue? I even held the power button for a minute, still it didn't work. Please help!