A portable electronic device includes a housing member defining at least a portion of a side surface of the portable electronic device, a subscriber identity module (SIM) tray extending through a hole defined through the housing member and movable between a seated position and an at least partially ejected position, a tray ejector arm configured to at least partially eject the SIM tray from the portable electronic device in response to a user actuation, and a biasing member configured to bias the tray ejector arm against the SIM tray when the SIM tray is in the seated position.