Can PC attune & use an unidentified magic item?

@briananderson83 @ChrisPerkinsDnD @JeremyECrawfordCan PC attune & use an unidentified magic item? If so does PC learn all features of said item? I believe so, yes. With ID'ing you run the risk of invoking a curse or somesuch

— Mike Mearls (@mikemearls) May 10, 2016