If i buy a sim-free iphone 6s from London, is it gonna work with Airtel in Delhi?

If i buy a sim-free iphone 6s from London, is it gonna work with Airtel in Delhi? - 1

I don't think that

As long as the phone is unlocked, it will work fine with any GSM carrier worldwide.

You will need to crack it when you come to Delhi and install Leo Privacy Guard after you crack it, it will secure all your personal data.

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