yes but you will need to unlock it.
yes
how to use u s i phone in india
No it wont
because in the US, the $199 will include the iPhone bound with a carrier contract for like 2 years. In India, the iPhone does not come locked with such carrier networks.Also in the US, in 24 months the phone usage can exceed $400 profit for the Carrier Network, and it is not seemingly so in India.
Nothing accha will happen because i will loose my 400 dollars for buying an i phone 5
yes. once an iphone is universally unlocked it will work.
In the continental US AT&T has sole exclusivity as the carrier for iPhone through 2011.
If you get it unlocked it should work. One way to make sure is that if your iphone is able to use T-mobile sim you are guaranteed your phone to work in Ethiopia.
Does my iphone work in Africa?
no
IPhone Application Development is popular in India because many Indians have Smartphones.