I need to know about buying iPhone overseas?

I'm thinking of buying a iPhone 5 in us or uk under contract and then bringing it to India and unlock and use it
Will it work?

You will have to finish paying the contract, if you aren't from those areas then you will have to a pay a big down payment regardless.

An unlocked GSM phone will work on any GSM network. So aslong as your cellular provider in India uses GSM sim network. Than yes. You'll have no problem.

The iPhone which you are buying in other country may be network locked. You need to unlock it to use with Indian GSM SIM card.
For example, If you are buying an AT&T network locked iPhone from US, It would work only with AT&T network. If you need to use it with Indian GSM SIM card, It has to be unlocked from AT&T's network restriction. You can unlock an AT&T network locked iPhone 5 safer and easier using remote unlocking service. You can get the remote unlocking service for an iPhone 5 from http://www.superunlockcodes.com/apple-iphone-5/rs16wp9/ at affordable cost with easy unlocking instructions. This is a permanent unlocking method and doesn't require a jailbreak too.

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