Tested using a Samsung YP-S5.
Install packages:
sudo apt-get install mtpfs mtp-utils
Connect your device via USB and open a terminal:
dmesg
Check to see an output similar to:
[ 3962.140179] usb 4-1: new high speed USB device using ehci_hcd and address 3 [ 3962.292763] usb 4-1: configuration #1 chosen from 1 choice [ 4149.080225] usb 4-1: USB disconnect, address 3 [ 4171.172079] usb 4-1: new high speed USB device using ehci_hcd and address 4 [ 4171.359378] usb 4-1: configuration #1 chosen from 1 choice
Now when you run RythymBox you should have your device listed in the left hand panel!