Police say McGregor picked up the phone and walked away with it. The fan said the phone was valued at $1,000.
McGregor was arrested on charges of felony strong-armed robbery and criminal mischief.
CNN has reached out to McGregor’s press team, the victim and the UFC.
McGregor was previously handed a six-month suspension and fined $50,000 after an October post-fight brawl with Khabib Nurmagomedov, who scaled the octagon to launch an attack on McGregor’s team after defeating the Irishman to maintain his unbeaten 27-0 record last year.
Members of Nurmagomedov’s team were also involved in a fracas with the beaten McGregor.
Last April, McGregor was charged with assault, attempted assault and criminal mischief after he and others allegedly attacked a bus carrying UFC fighters at the Barclays Center in Brooklyn.
The incident left at least two athletes injured and unable to fight at the UFC 223 event two nights later.
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