Upon arrival at Indira Ghandi airport on an international flight and after locating my transfer service to a hotel, I asked where I could get a SIM card for my phone. I was directed to an Airtel kiosk. I provided my passport which they photocopied, and I paid 800 rupees. I was given a number to call to activate the SIM card. They also provided what was purportedly their phone number to be called if there were any difficulties. Needless to say, the SIM card could not be activated, and their phone number did not work. Numerous people tried to activate it, including people in the phone industry. One such shop told me I had been cheated. Two lessons: 1. Do not purchase a SIM card at the airport. 2. Get the person from whom you buy the sim to activate the card.
My friend also purchased a SIM card which could not be activated. The kiosk was doing roaring trade. Many people will have lost their hard earned cash at this kiosk. Once you have left the arrival hall, passengers cannot return to question the kiosk and receive a refund.