Tech Question

Carol has a question:
Hi!
Could you throw this out to the techie folks? I am thinking about using Google Voice to record my upper levels short speaking assessments. I am getting some push back. One young man is afraid of having his information compromised by Google saying the site is wide open. In other words, if he calls my Google number his phone number ergo all his personal information goes public. Is anyone on the blog familiar with these issues, My tech guy at school does not seem to have an issue.  I would appreciate some input. Thanks.
Chill