The record of slimmest smart phone in the world was carried by Motorola's Droid  RAZR.But,Fujitsu Arrows F07D became the slimmest smart phone in the world.
It's thickness is about 6.7mm.OS is Android 2.3.The resolution of 4 inch gorilla WVGA display is 480x800 pixels.The single core snap dragon processor has 1.4GHz speed.It has 512 MB RAM and 1GB internal storage .Camera is 5 mega pixel.It supports HSPA,GSM and LTE.Weight is about 109g.Battery is 1400mAh.
It has so many  good features but the thickness is the Speciality.We can buy Fujitsu arrows from NTT docomo from 2012 onwards.There is no information about the price.
     
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