What is the price of iphone 4 and 5?

Please also explain what is carriers such as at&t
please tell the price of iphones which can be used in india

IPhone 5 Price on Two-year Contract from AT&T, Sprint or Verizon in the USA)
16GB - $199
32GB - $299
64GB - $399

iPhone 4 will be pushed back to a free selling point on contract.

1) Carriers are Mobile Service Providers in simple language. Like we have Airtel, Idea, Vodafone, etc. In India; in USA, Sprint, T-Mobile, AT&T, etc. Are mobile service providers.

2) In USA, iPhones are sold at half or less than the actual price of iPhone, by mobile service providers (AT&T, Sprint, etc) on a 2 year contract basis. Means after you get an iPhone for cheap ($99, $199, etc), you have to compulsarily use that particular mobile service for a period of 2 years with hefty bill per month! Also, if you want to break the contract, there's some big amount of fine that should be paid by you to that particular service provider. After completing the contract period, you can unlock the iPhone. If you want freedom & want to use any sim/service according to your own wish, there's a 2nd option. You can buy a FACTORY UNLOCKED iPhone by paying full price ($649) of iPhone & use any sim, anywhere.

3) In India, Airtel & Aircel provide iPhone on contract basis. Also, Reliance Digital, Chroma Store sale the factory unlocked iPhones. IPhone 5 price in India will be 44500/- (it's going to be launched in India in the next month)… So, iPhone 4S price will also come down by 5000/- in the next month & it will be available @ 34-35000/-… IPhone 4 will be available @ 28-29000/- after price cut.