The cables that get shipped together with mobile phones and are part of the package allow you to charge your phone and also to transfer data to/from it. So, they aren't usually charge-only type of cables. The power-only cables don't have the necessary pins to transfer data, and that's the type of cable that Coinkite sells. Your phone's cable most probably does. Someone paranoid about their security would prefer a cable that doesn't have data transfer pins.