I have 2 phones. One is 4.0.4 and the other is 4.2.1. When I connect 4.0.4 to PC, the phone prompts to start PC Companion (software). But when I connect 4.2.1 to PC, the phone pops a button "TURN ON USB MASS STORAGE" Once I touch the button, I can browse both the phone memory and SD card. I can move files between PC and SD card. Is this a standard feature of 4.2.1? I just wonder if I can get the same feature once I upgrade the other phone to 4.2.1. Thanks.