I want to read data from a USB serial port of the mobile phone ( Alcatel OT-806D ). The cable connects the phone and the computer. The system running in the PC is Windows XP. I launch a java j2se program which writes a number to the usb serial port. And in my midlet I run a j2me which will read on the usb port. The problem is that the output displayed in the item on my midlet is "The requested protocol does not exist comm:0". So why there is this error , and how to correct it ?