The Samsung GT S5303 from Samsung is another phone which you can connect to your USB tether cord and access the phone from your computer. You will have to install the USB driver for Samsung and will then have to access the phone from the software menu system. This is standard software for the Samsung range of mobile phones including the Samsung GT-S5303.
Below you will find the driver as well as the Samsung USB driver.
With this driver you should be able to access most Samsung range of mobile phones. See the link for the software as well as a standard Samsung mobile phone driver.