McGregor was arrested Monday evening.
The Miami Herald reportthat McGregor was charged with strong-armed robbery and misdemeanour criminal mischief, according to Miami Beach police. McGregor then picked the phone up and walked away with it, according to the report.
"The defendant then stomped on the victim's phone several times, damaging it".
The victim reportedly told police the phone was worth $1,000.
Conor McGregor just completed his community service for a insane bus attack he was involved in back in October, and already the former Ultimate Fighting Championship has found himself back in trouble.
McGregor was reportedly spending time in Miami as he prepared for his return to the UFC. His girlfriend, Dee Devlin, and son Conor Jr. were also in Miami.
McGregor was apparently on holidays in the area.
McGregor went on to plead guilty to disorderly conduct and, in addition to the community service, was forced to attend three days of anger management courses.
Back in April 2018, McGrregor was arrested after he attacked a bus full of UFC fighters following a UFC media event at the Barclays Center in Brooklyn.
Conor McGregor after a post-fight incident following his loss to Khabib Nurmagomedov at UFC 229.