看来把手机赛进去藏起来挺费劲，拿出来用需要一个place holder，不然不好放回去。
you examine the bar of soap on the prisoner’s sink. The safest place for an
inmate to store anything is in his rectum, and to keep the orifice supple
and sized for the (contraband) phone, inmates have been known to whittle
their bars of soap and tuck them away as a placeholder while their phones
are in use. So a short and stubby bar means a durable old dumbphone; broad
and flat means a BlackBerry or an iPhone. Pity the poor guy whose bar of
soap is the size and shape of a Samsung Galaxy Note. http://www.theatlantic.com/features/archive/2014/09/how-gangs-t
