I have a cheap F8 java phone from China with a 4G TF (micro sd ) card installed. When I connect the phone with the USB cable to my WIN7 PC. The phone shows 2 options for USB confguration, 'mass storage' and 'com port'. I picked 'mass storage' and click OK. It comes back with successful. But I cannot see the TF card showing up on my PC. I hope that it will shows up as removal drive. I try to use the file manager on my phone, it says USB function not allowed. If I disconnect the USB cable, I can browse the file on he TF card or the phone's internal memory using the file manager.
I am not sure what the other option 'com port' does and if I can allow me to access the TF card.