When the knife plunged into Efrain Guaman’s gut, he was consumed by pain — and felt abandoned by his fellow straphangers.

“Nobody helped me,” Guaman, 30, told The Post.

The Queens man was left clinging to life Friday after a thug on the N train in Brooklyn plunged a blade into his stomach and snatched his iPhone.

“It happened so fast, I didn’t realize what he was trying to do,” Guaman said in an exclusive interview from his bed at New York Methodist Hospital.

“Give me your phone or I’ll stab you!” the attacker shouted without giving Guaman a chance to respond.

The tall young man with a neck tattoo bolted as the train entered the Atlantic Avenue-Barclays Center Station in Downtown Brooklyn.

Other passengers didn’t stick around.

Surrounded by his tearful family, barely able to speak above a whisper and with tubes running through him, Guaman said no one responded to his pleas.

“I asked for help. They all ran because they were scared,” Guaman said.

Struggling with the searing pain, Guaman managed to pull the emergency lever in the subway car.

“It took 30 minutes for emergency to come,” he said. “I couldn’t think of anything. I just felt the pain.”

His cousin Leslie Guaman said, “A lot can happen in 30 minutes. He could’ve died.”

Police have tallied 30 knife attacks in the city’s transit system this year as of May 15.

Despite reports highlighting the rise in subway stabbings, Guaman’s family was shocked by the attack.

“People will do anything for an iPhone now,” Leslie Guaman said. “You hear things, but you don’t think they’d happen . . . You’re in such a vulnerable place” on the subway.

It may be a week before doctors let Efrain Guaman go home, his family said.

Guaman was on his usual commute to his uncle’s Sunset Park store, where he has worked for a decade, when he was attacked.

“I wasn’t afraid before — I ride this train every day — but now I am,” he said.

The attacker is still at large.

“May God forgive him,” Guaman said.