I have this number as being used by my internet router. I would like to know what phone it's connected to, and if it's a internet phone number. I have people staying in my home that i thought i could trust. My data usage has  been pretty high and i need to find out why. This number was not obtained by me, i ann the owner of the service. It's through at&t. Please help if possible. I think it was obtained without n.Y. Knowledge.
Thank you
john wells