settings>about>phone identity>Device serial number
XXYMDAABBBBB
XX = Manufacturing location
SZ = Shenzhen, China
SH = Shanghai, China
HT = Hsinchu, Taiwan
CH = Wuhan, China
Y = Year (2 = 2012)
M = Month (hex 1...C = 1 - 12 months)
D = Day (hex 1...9A..Z = 1 - 31 days)
AA = Part Code
BBBBB : Identification Number (decimal)