Kevin Hart’s prank war with Nick Cannon has reached a new level.

The “Fatherhood” star poked fun at Cannon’s fifth, sixth and seventh children being born in June. He posted his pal’s cell phone number on billboards in Atlanta, New York City and Los Angeles.

“For any advice on fatherhood? Call my best friend Nick Cannon,” the billboard said, adding Cannon’s cell phone number below it. It’s accompanied by a photo of Hart with a llama.

“Since my brother @nickcannon decided to buy me a lama for my B Day I decided to do something nice for him as well….Here is a digital billboard in Los Angeles….I also did some in ATL & NY….if u want any advice on fatherhood please call my BEST FRIEND @nickcannon ….I’m sure his phone has been ringing nonstop,” Hart wrote in the Instagram caption.

Revolt TV reported that Cannon responded in an Instagram Story confirming that he’d been receiving tons of calls.

The soon-to-be talk show host said he’s taken 20 calls from fans from places including Zimbabwe and Nigeria.

“Look at that. It’s coming in double numbers at a time. It just won’t stop ringing, and now there’s a white screen,” Cannon said. “My phone is ruined!” The star vowed to get his pal back someday.

Footage obtained by Access also showed Cannon taking FaceTime calls with fans.

As of Monday, the number appears to be disconnected.