True, but I can't even remember my cell number from 1999, let alone still have the records around. I don't even think the company I had at that time even exists today, so I haven't a clue about how I could begin to provide those records.
If he was using a state or business phone, you might have a better chance, but even these records might be subject to a records destruction schedule, although the provider might still have them.
Would a cell phone provider turn over 9 year old records without a court order? It's often hard to get them to pay attention to your current needs -- they'd laugh at me if I asked them for stuff from 1999!
I would start with the easy one Mr.Young in Oct.2007.Did he call Larry.Mr.Young is dead.