One of my first experiences was to get a simcard in Delhi for my phone. You can go to Airtel, near the hotel, it is just next to Kailash Colony metro station. Don’t forget to bring you passport and your passport photo. And try to fill in the grid very clearly, they made me fill it in the grid three times as there were some crossing-outs. Then, you will need to dial a number to activate your simcard. You can recharge it really easily, you just have to go to an Airtel boutique, give the amount you want to recharge and they will recharge it in two seconds.