For straphangers, these thieves were Public Enemy No. 1.

Two bandits ripped off cellphones and cash from victims as young as 14 during a string of robberies on the No. 1 line in Manhattan, cops said yesterday.

The crime spree began at 10:45 p.m. on April 17, when cops say Ronald Pinnock, 20, and Anthony Rivera, 22, snatched a teen’s BlackBerry and barked, “You will get f- -ked up if you don’t get off the train at the next station.”

They struck again at 9:54 p.m. on April 25, when they confronted a 20-year-old Brooklyn man on the local train at West 23rd Street and Seventh Avenue, cops said.

When he refused to turn over his phone, Pinnock allegedly said: “We can do this the hard way. We can beat your ass.”

The victim gave up his cell.

On the night of May 2, the duo followed a 14-year-old boy off the No. 1 train at 18th Street and Seventh Avenue, cops said.

Pinnock allegedly asked, “Yo, you have a phone?” while he and Rivera grabbed the boy’s arms.

The frightened youth forked over cash.