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I only recently realised that if I pinch the homescreen, the widgets will float and respond to vibrations:) Awesome.:smileylaugh:
Yah shake that osm---
any other hidden feature any one know as bug firmware make Xperia doing all this stuff lol
It probably is just Google playing with its users. Like "Google Doodles". For example, go to Settings > About Phone > 'Click on "Android Version" repeatedly, then try to soom in and out/ press your Android logo virtual toy:)
try to dial *#*#7378423#*#*
you can test hardware functions 
Awesome:smileylaugh: