Bought iPhone 4 from colleague and I want to use it in India

Hello Community Members,
I have recently travelled to Colorado for a project and my colleague bought iPhone 5, so I just happen to ask him to sell me his iPhone 4, so he did. Now, I have purchased this iPhone 4 from him. It's an A1332 model. So I know, it's a GSM phone. So my questions what is procedure to use (or make it work) in India?
Do I have to jailbrake or unlock it? Or just by inserting an Indian GSM SIM card (of course, cutting to micro SIM size), will it start working out of the box?
Thank you people for your reply in advance.

If your colleague purchased the iPhone as officially unlocked or had it unlocked by AT&T, it should work with any compatible carrier. If it was purchased locked to AT&T, they will have to unlock it. Here are AT&T's official requirements and procedure for unlocking an iPhone:
https://www.att.com/deviceunlock/client/en_US/
Regards.

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