Graphic: Dionne Gain Up until Wednesday morning Telstra, like many other companies, protected its customers' data using just one key piece of information: a subscriber's date of birth. I was essentially able to see their phone's, although not who called them. I was also able to see their home address, account number and chosen plan. Once in, I was able to see who they called, from where (down to the suburb), at what time and date and the duration of calls. I hacked a friend's Telstra mobile account with their permission late one night this week, using just one trivial piece of information.
