CHENNAI: With the demonetisation drive pushing India to a cashless society, people fear losing money in cyber frauds. Credit cardholders with high limits are more worried.Realising the need to make their elite customers feel secure, some banks have developed apps that allow customers to block, unblock or change transaction limit on their cards. ICICI Bank Axis Bank and City Union Bank have their versions of such an app.Cardholders can set geographical limits in a way that a card can be used only in a 5-km or 25-km or even 250-km radius (the range varies up to 1,000 km). This eliminates the possibility of money being siphoned off from a distant ATM in China or Thailand. “When we see any suspicious transaction on our mobiles, we usually contact the bank to block it. At times we might forget the card number or not have our account number at hand to start a phone banking session.Vital seconds could be lost and more money siphoned off before we actually succeed in getting it blocked," said Suresh Rajagopalan, President (Software Products), FSS, one of the companies that work with banks in creating such apps.Blocking and unblocking your card on these apps is as easy as switching on or switching off the FM station on your mobile. City Union Bank, which has implemented this for users of its mobile banking app, said that it introduced this measure because of recurring data breaches in the banking system.With the ability to set daily limits and restrict transactions, one's debit or credit card becomes safe for multiple users. “If you give your debit card to your driver to pay for petrol, you can set a limit of say, Rs 2,000, so that he cannot spend beyond that. You can also control the number of transactions, so that the person can't swipe more than once," said N Kamakodi, CEO, City Union Bank.The facility also lets the card owner control the nature of purchase. “If you are giving your card to your daughter to pay her college fees. You can restrict the merchant category , which would in effect mean that she can withdraw money at an ATM or swipe at the PoS machine at her college counter.But she can't use the same card at malls, restaurants or cinema theatres," said Rajagopalan.Axis Bank is also looking at active prevention of hacking , overseas transactions and fraudulent use of debt cards with their switch-on and switch-off facility.