Samsung Galaxy S phone USB device recognized by host VirtualBox OS but undefined in guest OS My phone model is 


  Samsung Galaxy 
  
  S SGH-T959


When plugged in via USB cable, the phone is well recognized by Windows as below snapshot. 





But when I select the Samsung phone device from Device menu of the  VirtualBox guest OS window as below snapshot, the device is not regconized after Windows try to auto update driver for that device :(
Is the USB icon on the VirtualBox enabled on the guest OS. 

If that's disabled, the USB on the host side will not pass it through the guest, this requires the handset plugged in host side.

It's a small icon on the bottom of the VM window, near the hard disk where it shows blinking activity? Click on that, to enable USB pass-through.

Are you intending to flash the device from within a VM?