Will A AT&T Iphone 5 Work In India?

If It Will, Which Service Provider Will It Work? Is Jailbreak Required?

IPhone 5 is available in India - http://shop.airtel.com/pages/iphone
No jailbreaking required

Before take from there inform over there they will change in application then here in India it will work, else buy at India only it's available all major network service provider have sale, service & network facility

You need unlock it.

Yes, but that need to be unlocked here. You may have to spend about 2000 to unlock it.
After you unlock it you may use any service Provider…

AT&T network doesn't exist in India. You will need to use a local network like Airtel or Vodafone.

The Verizon iPhone 5 is GSM unlocked, tested with AT&T
By Jeff Benjamin, Sep 21, 2012

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I can confirm that the Verizon iPhone 5 is indeed GSM unlocked. Even though I bought an iPhone 5 from Verizon under contract, I was able to cut down my AT&T Micro SIM, and use it in my Verizon iPhone 5 to pick up an AT&T signal. By doing so, I was able to hop onto AT&T's HPSA+ network, or "4G" as they so ridiculously name it.

AT&T's so-called 4G speeds are nothing like true LTE speeds, but they are a bit better than typical 3G speeds. But the big news here isn't about speed. The big news here is that we have confirmed that you can use a Verizon iPhone 5 on AT&T or T-Mobile, freely, even if you're a brand new customer under contract.