"How to unlock my Samsung Galaxy S4 which with a broken screen?"
"Any way to bypass the lock screen password on my Samsung Galaxy S6 with a cracked screen?"
"Is it possible to remove the lock screen PIN on my broken Samsung Note 4?"

To unlock Samsung with broken screen without losing data, what you need is just the Samsung Lock Screen Removal, which can be applied to many cases, including but not limited to:

Passwords are forgotten when a Samsung phone has been left untouched for a long time.
Screen patterns are changed by someone by mismake.
Your Samsung is locked when one has tried to figure out the right password.
A second-hand Samsung phone is locked with a fingerprint of the previous owner.

Related:  Recover data from a broken Samsung