I recently asked Pacific Bell to put blocks on our telephones so our clients could not make long-distance calls on these phone lines. I was very specific. I stated, "I do not want any long-distance calls billed from these phones."
They were very specific and stated there would be no problem, your clients will not be able to make long-distance calls and they can only call locally within a 15-mile radius.
Sounds good, right? Wrong! What they did not tell me was that the clients could call operator assistance and have the operators call long distance for them and bill it to the blocked number.
Also, the clients could accept collect calls and they would also be billed to the blocked number. As you can imagine, I was very surprised to find a significant number of long-distance calls on the telephone bill.