While I have gone through the phone bill of a cheating partner, I did not use any kind of professional resources to do it. I was able to get the info from the phone company. His mistake here is not going through her phone. Anyone being cheated on would do the same, you're right. However, not everyone has the means that he used at their fingertips. He abused that instead of just going about it the old school way and doing the legwork without using work resources.