If you wish to connect your Samsung Galaxy A3 mobile phone to your computer then you are going to need to download the Samsung USB driver software. You will find a link to this listed below. Search this website for more information about the Samsung range of telephones.
Samsung A3 USB Driver
The Samsung Galaxy A3 had many good features such as an excellent design as well as a good sized screen. Battery life is also good and best of all the price is very good for this type of mobile phone. The camera however has not been good on the camera. The link below will take you to the download page.