Go to SETTINGS>GENERAL>ABOUT>MODEL then kunin nyo yung last 3 or 2 letters na makukuha nyo kasama slash.
EXAMPLE:
MODEL: MG603LL/A
COUNTRY: USA
MOST COMMON COUNTRY CODES
LL/A - USA
J/A - JAPAN
PP/A - PHIL
CH/A - CHINA
KH/A - KOREA
B/A - IRELAND/ UK
BR/A - BRAZIL
X/A - AUSTRALIA...