He has charged with strong-arm robbery and criminal mischief; his bond has been set at $12,500. The whole incident was reportedly caught on camera.
The alleged victim, a 22-year-old from Slough, said the phone was worth around 1,000 U.S. dollars (£755).
He was arrested after he allegedly smashed a fan's phone outside a hotel.
The colourful fighter was booked into a jail in Miami-Dade County on Monday night. "Last evening Conor McGregor was involved in a minor altercation over a cell phone that resulted in a call to law enforcement", wrote McGregor's attorney, Samuel Rabin, in a statement released to MMAFighting.com.
Miami-Dade County Corrections and Rehabilitation
McGregor is facing robbery and criminal mischief charges.
In late January, McGregor was suspended six months by the Nevada State Athletic Commission, retroactive to his role in an October 6 brawl with Khabib Nurmagomedov, who won their lightweight championship bout at UFC 229.
Chiesa filed a civil lawsuit against McGregor seeking damages for "severe emotional distress, mental trauma and/or bodily harm".
McGregor received a six-month suspension for his part in the melee, in which he was attacked by two of Nurmagomedov's associates.
Nick Foles' Contract With Jaguars Expected to Be Massive
In 2016, Foles returned to Philadelphia to mentor Wentz and wound up becoming a fan favorite and a Super Bowl champion. Philadelphia opted not to use the franchise tag on Foles, allowing him to hit the open market.
Weather warning for snow and ice to continue into Monday
The Queen Elizabeth II bridge across the Thames at the Dartford crossing was closed due to strong winds on Sunday morning. It will start to influence our forecast as early as tonight with rain and snow showers moving into southwest Colorado.
USA citizens will need a visa to visit Europe starting in 2021
An ETIAS authorization will be good for three years, allowing Americans to travel freely between the Schengen countries. The website calls itself "a professional travel agency" and is "not affiliated with any European Government".