i got now IPhone 8 plus from dubai so is it possible to install facetime on dubai haodset using in India

No. As FaceTime is not allowed in Dubai, any phone originating from there will not have FaceTime, even if you later move to a region where it is allowed.

If you intend to use the phone in India I suggest buying a phone in India.

Not if it originated from the United Arab Emirates(if it didn’t, it’s an illegal import.)

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