I bought the airtel sim some days back and I was said it would activate within 2-3 days of purchase. But to my utter surprise it took nearly 1 full week to activate the SIM. Not just that it also took more then 10-20 calls of why is it taking so long to activate calls without any explaination. It was very irritating and agonizing for me. Since then I stopped using the sim. now I used sim from other operater