Sup3r wroteGeorges00 wroteBypassing the lock screen on Samsung smartphones is easy.
I also did it to my friend who forgot his pattern.
I remember an exploit in older android versions while I was trying to unlock someone's smartphone, usb debug wasn't enabled. Didn't get through, I don't think there's public exploits about bypassing a stock android with latest updated firmware.
It was a girl's phone so I don't think usb debugging was on.
I just completely deleted the lock screen
Did not try on newer phones though.
You basically flash a custom recovery, open a file manager from there and delete the lockscreen file.