I seem to be having an issue with my radio not turning off after I remove the key from the ignition and open the door. The radio is stock and I have never removed it nor installed any audio equipment to the car. The radio displays the word "phone" in the bottom left corner, which is something I have never seen before. I am not noticing any other electrical issues, just this. I have removed the radio fuse so that the battery doesn't die. Any ideas or suggestions as to what could be causing this?