LIL ZA ARRESTED AGAIN ... FOR VANDALISM IN JAIL

Justin Bieber's pal Lil Za just pulled a double -- he's getting arrested for a SECOND TIME today ... while STILL under arrest, and it's all over a shattered phone ... TMZ has learned.

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Sources tell us Za was minutes from posting bail and getting released from custody after getting busted for drug possession at Bieber's house this morning -- and then for some reason he flipped out and smashed a phone in the jailhouse.

We're told Za is now in the process of being re-booked for vandalism.

Best of all, depending on the value of the phone ... this could also be a felony -- to go along with his felony drug bust.

Carpe diem, Za.

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