Luka Doncic might want to look into an OtterBox sponsorship deal ... 'cause the L.A. Laker showed off how he handled the news of being traded from the Dallas Mavericks -- revealing he turned his phone into a cracked mess after chucking it.
Doncic did a sit-down interview with ESPN ahead of his playoff debut with the Purple and Gold ... in which he admitted he threw his iPhone once he hung up with his former squad.
While he didn't say how much effort he put into yeeting his cellular device, it was hard enough to do some damage.