Apple iPhone 4S just officially launched in India but founds that Siri doesn’t support with Indian accents. Apple India site also not mention Siri on their feature page of iPhone 4S while it’s found on the Apple US website. Apple iPhone 4S page on both the website looks similar but missing Siri feature on Indian Apple website. Take look at both the website’s feature page.
Apple India page for iPhone 4S
Apple US page for iPhone 4S
Siri for iPhone 4S is an intelligent personal assistant that lets you speak voice commands in natural English and it brings instant answers from the web. Siri on iPhone 4S lets you use your voice to send messages, schedule meetings, place phone calls, and more. But unfortunately Siri does not supports Indian Accents as some Indians speak English with an accent very close to a Standard British accent and vowel sounds is different from Standard American English. As smart-phone market in India is very huge, Siri would support Indian accents in near future. Siri is obviously available in the iPhone 4S that Apple ships in India but they won’t officially support it.