sending hex frame to phone via usb device

how to send command to mobile phone via usb device? my device using ftdichip ( www.ftdichip.com ) i don't understand how to handle usb on visual basic. unlike mscomm1 you can send command to phone via com1

with like this

VB Code:

pause(100)
thex(1F 00 12 AD BB FF)
pause(100
thex(1F 00 12 AD BB FF CD A1 0A)

br,
:wave: