Can i buy a no contract iphone in US and use it in India?

I'm planning to buy a no contract iphone in US. If there's no contract then can i remove that sim card and use mine in india? Or will it be locked? If its locked can i unlock in India? Do i have any problem in doing so?

Yes. There are various way to buy iPhone with out contract deals.

Be careful.
even an no-contract phone is still locked to the network you buy it from.

You need an Unlocked/ SIM Free iPhone,
and you can only buy that directly from the Apple Store not from a network store.

It can be done, but only at an apple store.

You are better off buying one that is already unlock.