not that people actually care about the truth anymore...
her t-mobile, along with vin diesel's was hacked becuase t-mobiles have this option that allows it's users to sidestep the 'enter yout password' section of the voice mail if they are calling from the phone that voice mail is set up on.
All that was done was that the phone number was spoofed and the voicemail was called. the voicemail believed it was getting the call from the proper phone, and allowed access to the system, per the settings.
nothing as silly as knowing the dog's name