A female victim called to report that a male suspect (BM, 15-20 years, slender, baggy grey sweatshirt, blue jeans, grey beanie) grabbed her iPhone 7 from her hand while she was on the platform. The male ran out of the station with a female (BF, 15-20, slender, dark green or black flannel shirt, blue jeans) and exited the Allston Street exit. They were not located and the phone could not be tracked. The victim was not injured. Station video will be requested.