The suspects threatened employees and fled the scene with a number of cellphones.
Police spokesperson Sergeant Noloyiso Rwexana is appealing to anyone with information to come forward.
“I can confirm that a business robbery occurred at 4.45pm at a cellphone store in Ottery Road, Ottery,” she said.
“According to information, four unknown suspects entered the shop and threatened the employees with a firearm and fled the scene with an undisclosed number of cellphones.
“We appeal to the public; anyone with more information that can assist with the investigation is requested to contact Crime Stop on 08600 10111.”