The holdup happened Monday at a Sprint Store located at 7830 Good Middling Drive.
Police say the woman came in carrying a large military-style long gun and demanded cell phones from a clerk.
She then fled in a dark blue Mazda.
The suspect had dark colored hair and was wearing a green tank top with black horizontal stripes, black pants, and black sneakers with a tattoo on her right shoulder blade.
Anyone with information is asked to contact Detective J. Lewis with the Fayetteville Police Department at (910) 703-9503 or Fayetteville / Cumberland County Crimestoppers at (910) 483-TIPS (8477). Crimestoppers information can also be submitted electronically by visiting http://fay-nccrimestoppers.org and completing the anonymous online tip sheet, or by downloading the FREE "P3 Tips" app available for Apple devices in the Apple App Store and available for Android devices in Google Play.