Apple does not have an "international" warranty, so you would be very wise to assume that if you buy a phone in Dubai, the warranty will not be good in India.
The same would be true if you purchased an iPhone in the U.S. and the phone required service in India.
The authorized Apple repair shop in India might be able to help with warranty....and they might not. It is impossible for users in the U.S. to predict what answer that you might receive from a shop in India.
From experience, I can tell you that an iPhone purchased in the U.S. will not be covered by the warranty in the U.K.
What you should do is contact the authorized Apple repair shop that you would use in India and ask them if they will honor the warranty for an iPhone purchased in another country.
If the shop's answer is "yes".......ask for this in writing from the shop.