Here it is ... footage showing Conor McGregor stomping out a cell phone in front of the Fontainebleau hotel in Miami -- and it's LOUD.
You don't only SEE Conor putting his foot down on the phone, you HEAR it -- two thunderous booms as McGregor slams his designer shoe down on the phone around 5 AM Monday morning.
You can also see and hear the alleged victim, Ahmed Abdirzak, plead with McGregor -- "Let me get my phone, man!"
Abdirzak tells TMZ Sports he was just trying to snap a pic of Conor on his cell phone when the UFC star lured him in by appearing to offer a handshake, but instead snatched the phone and smashed it.