About 10 years ago when I still had a Modem Connection on my computer, I got a phone Bill that was for about $700 and noticed calls out of the country......At the time the Boy's were still at home and I blamed them for making the calls...they swore they didn't make then ....So.....I "Said" who did.......
Found out I had a "Dialer" Worm in my computer.....everytime the computer was turned on ...the Worm or Whatever, called the number which was in the Virgin Islands, and I got stuck paying the bill.......That was when I switched to Cable Hookup........
It does happen.................
Ken