Now, they're hoping surveillance images of the women will lead to arrests.
Detectives say the three suspects worked together to steal the victim's phone on a southbound F train at the Jay Street-Borough Hall station around 6 p.m. on July 29.
One suspect grabbed the phone, while the other two physically prevented from trying to retrieve it.
No injuries were reported at this incident.
Anyone with information in regards to this incident is asked to call Crime stoppers at 1-800-577-TIPS (8477).