iphone5 in India

[Barbarao104]

I bought an UNLOCKED iphone5 in usa to send to my son in India. He put in his sim card from IDEA provider and cannot connect to the network.. It finds no network.. He said it showed something like Worldwide Grunti.. I have no idea what this is... but it says it found no network.
what do we need to do to get the iphone5 working so he can use it. It is new unlocked phone.

please advise
thank you
Barbara