The incident happened back on December 1st in the 1400 block of North Howard Street.
According to police, the victim, a 29-year-old man was approached by the suspect who was armed with a handgun.
They say the suspect threatened the victim and demanded money.
He then fled with the victim's iPhone and a wallet containing $60 in cash, credit cards and identification, police say.
He was last seen going south on Howard Street toward Master Street.
The suspect is described as a black male, dark complexion, 25-35 years-of-age, 5"8"-5-10" tall and 170 pounds.
He was wearing a gray hooded sweatshirt and blue jeans.
Anyone with information is urged to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through PhillyPolice.com.