Who is your carrier? I see it's ATT. That looks like something from an MNVO or Ting, or Skype service. If you have a limited calling service, that would be saying how much time you used.

If you have unlimited, where did you get the phone? Some people buy phones from the services like the ones in the supermarket and then just put their SIM in.

The other place you can check is his messages if he does use messaging. There could have been a spam text for this service.