Samsung phone

[Stephen]

I want to connect a Samsung GT-S7560s cell phone with android 4.0 
operating system to Ubuntu 12.04 as a mass storage device.

When I plug it in the usb port and choose to open a folder I can see all 
the directories that are on the sd card but I can't access any of the 
files in them. I need to have usb access to add and remove files from my 
phone.

Can anyone help me with this. Thanks in advance;
Stephen