The teenager was approached by the two men in the wooded area next to the Charlotte Place pocket park on the Grange Estate between 4.30pm and 5pm, on Saturday, October 1.
The men pushed her before demanding she hand over her mobile phone.
She handed the phone over and the offenders ran off in the direction of the allotments.
The first offender was white, aged 18 to 20, 5ft 9in, of medium build and was wearing a black zip-up hooded top, with the hood zipped up over his mouth.
He wore black tracksuit bottoms, with a white triangle logo at the top of the left leg, grey muddy trousers and had stubble.
The second offender was of mixed race, 18 to 20, about 5ft 10ins, thin, with a mole above his left temple, dark bushy eyebrows and stubble.
He wore a light grey hooded top with the hood up and black jogging bottoms with two white stripes down the side.
He was wearing a small blue bag with a long shoulder strap.
Officers would like to speak to anyone who may have witnessed this incident or who may have any information regarding it.
Witnesses or anyone with information about this incident can contact police on 101 or Crimestoppers anonymously on 0800 555111.