Jailbreaking for Nokia Lumia 900 and iPhone 4?

Hi… IIm willing to buy a Nokia lumia 900 and iPhone 4 from USA. But i live in india, my uncle will bring these phones… Do i need to jailbreak or sort of thing to use these phones in india… If ye then how… Please give a complete discription… And i also wanted to know that how to run 3rd party aps in 900?

No. In both cases you need to get them unlocked in order to work.
Jailbreaks only concern iPhones anyway.
As far as running apps on the Lumia just download what you want from the Marketplace

You need jailbreak and then unlock it to use in india.

No you don't
buy them from ebay or amazon and let your uncle bring them to you

How do I root ma lumia 900