Samsung updates its device Samsung Z2 with new firmware from 188.8.131.52 (Z200FDDU0BPL2) to 184.108.40.206 (Z200FDDU0BQA2). The size of the update is 27.4 mb. Updated my device, must be bug fixes and stability. One Icon of Wifi Calling can be seen in the swipe down menu.
Better to check the changes mentioned in the screen shots below. The first screenshot is for the old version.