When {TAIL ~ the operating unit} is at a stored position, the second shafts of the operating unit is moved from the front side of {HEAD ~ a mobile phone} to the back side thereof, so that the operating unit is closely attached to the back surface of the mobile phone 
When { TAIL ~ the operating unit } is at a stored position , the second shafts of the operating unit is moved from the front side of { HEAD ~ a mobile phone } to the back side thereof , so that the operating unit is closely attached to the back surface of the mobile phone
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH