Arrow GSM & 3G on India Networks -Reliance

Hello,
I am going to purchase Droid4 XT894 in US for use in India - GSM 3G Reliance Network. I have couple of questions :
-- Will it work in India ?
-- Does 3G Data work ?
-- Which O/S - ICS, JB,...

Appreciate if anyone in India is using and their feedback...
Thanx.