The “Notorious One” apparently didn’t learn his lesson.

Former UFC champ Conor McGregor was arrested Monday for allegedly going berserk and smashing a fan’s phone outside Miami’s Fontainebleau hotel — just days after completing ­court-ordered community service for his 2018 dolly-throwing rampage at Barclays Center.

The 30-year-old Dubliner was charged with strong-armed robbery and criminal mischief for the early-morning incident. Cops say he “slapped” a fan’s $1,000 phone out of his hand and then stomped on it.

The man was trying to take a photo of McGregor when the mixed martial-arts star set upon him, police officials said.

The two men had been walking out of the famed oceanfront resort — home to the LIV Nightclub — when they encountered each other at around 5 a.m., the Miami Herald reported.

Early-morning surveillance footage allegedly shows McGregor mid-mayhem.

The former lightweight and featherweight champ was arrested Monday evening and transported to a Miami-Dade County jail, where he posted bond. He was released just after 10 p.m.

Footage captured outside the jail shows McGregor calmly walking out and being greeted by a scrum of reporters.

He appeared to remain silent.

McGregor’s lawyer, Samuel Rabin, released a statement saying his client “was involved in a minor altercation involving a cellphone that resulted in a call to law enforcement,” but the attorney offered no other details.

“Mr. McGregor appreciates the response of law enforcement and pledges his full cooperation,” the statement said.

The rowdy fighter has been one of the biggest names in mixed martial arts over the years, but he nearly destroyed his career last year with his rampage in Brooklyn.

McGregor had been ordered to perform “manual labor” stemming from the April 5 incident, which saw him chuck a hand truck at a bus full of UFC fighters — one of whom suffered a a serious eye injury from broken glass.

The community service included five days of work at two Brooklyn houses of worship.

But it seemingly wasn’t enough to keep McGregor, who had been given a sweetheart plea deal, out of trouble.

It’s unclear what kind of punishment McGregor will face from authorities or the UFC as a result of Monday’s arrest.

The fighter was not hit with any disciplinary action for the Barclays incident. He did receive a six-month suspension and $50,000 fine following a brawl after a Las Vegas match in 2018.

Neither the UFC nor its president, Dana White, commented on McGregor’s Miami arrest.