A mugger hurled a 10-year-old girl to the ground and kicked her in the face before swiping her cell phone in a disturbing Bronx attack, surveillance video shows.

The suspect followed the young victim — who was holding her iPhone 7+ — into her building near Holland Avenue and Pelham Parkway North in Allerton at 4:50 p.m. Monday, police said Saturday.

Video shows the suspect strolling into the lobby — where he stood for a few seconds, before creeping up on the pre-teen and grabbing her as she walked through another door.

The assailant is shown knocking his young victim to the ground and delivering a swift kick to her face before taking off with her phone.

He remained at large Saturday evening, cops said.