Britons with Android smartphones and tablets have been urged to watch out for fake software updates that could give away passwords, financial information and even let criminals take control of their devices. Computer security company McAfee warned it had noticed a spate of malware trojans originally from Brazil targeting the Google Play Store and trying to trick users into downloading them. In Britain, where phones with the Android operating system account for almost half of the market, people have also been told to be on the lookout. The cybersecurity company McAfee warned of sophisticated banking trojans attacking Android smartphone users