Hi, my name is Milo I'm from Belgrade, Serbia and I have a problem with it, so I decided for your help. I took the phone SEj20 daughter Hazel, who was on her card was active, however, when I put my card, the phone just shows the logo and can not be turned on, it blocks. Without the card turns on and displays the demo, you can connect to the PC, but any SIM card not accepted, does anyone know what the problem is and can you help me?