Cops are searching for the brute who stabbed a 40-year-old man during an iPhone robbery in a Brooklyn subway station, police said.

The suspect knocked the phone out of the victim’s hands while aboard a southbound F- train that was pulling into the 18th Avenue stop in Borough Park just before 2 a.m. Sunday, police added.

When the victim went to pick it up, the knife-wielding robber slashed him in the lower back, police said.

He was taken to Lutheran Hospital where he is in stable condition, police said.

The thief ran off with the victim’s phone and remains on the lam, police added.