Ok, a friend of mine who has got an iPhone 4s, decided to use a debit card for the first time in his life to buy an app at Apple app store, 3 days later he got a call from icici asking if he did a transaction just then, he told no and they said it had been used at some sort of blacklisted site or ip or whatever and they are blocking the card. he checked and found an amount has been deducted, but it was not a big amount, it was more like another typical app purchase. He was told to file a dispute. Now, he has used card at restaurants and shops, but he is sure that its the appstore purchase which caused the problem for some reason. I am wondering if Apple leaked his card details or did he accidentally chose some subscription in the app or he is likely to be wrong in his thoughts.