Surveillance video captured the crime back on October 6 at the Metro PCS Store on the 2300 block of North 29th Street.
Click here to watch the surveillance video
The male suspect can be seen walking up to the counter just after 10 a m. dressed in full Muslim garb.
He reaches into a blue bag and simulated a gun before going behind the counter and taking an unknown amount of cash from the registers.
The thief then forced the employees into a back room before fleeing the scene.
There were no injuries reported.
Police describe the suspect as a black male with a dark complexion and 6'0" tall. He was wearing red Timberland boots, a full black Muslim garb covering his face and carrying a blue bag.
Anyone with information is asked to call police at 215.686.TIPS (8477) or text a tip to PPD TIP (773847).