When you can't get the data off your broken Samsung Galaxy Mobiles due to the broken screen, black screen, damaged touch screen or can’t enter system, what you need is Dr.Fone for Android. It can help you copy contacts, whatsapp messages, photos, etc. from your phone to computer at ease.
Also works with other devices like:
Samsung Galaxy S3, Galaxy S4,Galaxy S5;
Samsung Note 3, Note 4, Note Edge, Note 5.