We all should know that obtaining cell phone records of someone else is illegal. What many want to know is the exact section of law which prohibits it. This would pertain to attempting to get them, getting them, possessing and retaining them – anything and everything pertaining to them.
See H.R. 4709: Law Enforcement and Phone Privacy Protection Act of 2006,
and S. 2178: Consumer Telephone Records Protection Act of 2006.