[Q] need technical help about smasung gs3 - Android Software/Hacking General [Developers Only]

hey,
i am from India. My friend is going to gift me samsung galaxy s3 (unfortuantely and probably its t-mobile) from United States. i've no idea whether they are CDMA or GSM carrier. if its CDMA so my questions are :
can i get an unlock code which allows me access any gsm networks in India.?
And if it is GSM one, can i access 3g networks in India.?
i have read in a random forum that if its gsm carrier i can only use EDGE service in India.
AND the last one-
should i update official ics stock rom firmware for INDIA OR for The USA?

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Thank You to help me with my question.
No. The only US carrier to share the same 3G WCDMA bands as Canada is ATT.
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Thank You.
Yes I finaly find the Information (more technical)
Bell use 3G HSPA 850/1900MHz so any other phone that not have these frequency in HSPA doesn't work.

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[Q] Activate VZW Galaxy Nexus and Sprint GS3 on Indian CDMA?

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