The Pakistan Telecommunication Authority has advised smart-phone customers to be careful while buying mobile-phones from market.In a statement, it called upon phone purchasers to exercise caution when handling cloned or duplicate mobile devices.The PTA emphasized that customers should always buy phones from reputable retailers and make sure an active warranty covers the gadgets.The PTA also warned over investing in expensive devices that are being sold for exceptionally low prices or without a warranty.Source: Radio Pakistan