A door handle system for a door of a vehicle includes a door handle assembly, a locking mechanism, a control and a near field communication device. The door handle assembly is configured to mount at a handle region of a vehicle door of the vehicle. The near field communication device is operable to receive signals from a smartphone that is within a threshold distance from the near field communication device. The control, responsive to the near field communication device, is operable to determine whether or not a smartphone that is within the threshold distance and that is communicating with the near field communication device is an authorized device. The control is operable to actuate the locking mechanism to unlock the vehicle door responsive to a determination that the smartphone within the threshold distance and communicating with the near field communication device is an authorized device.