I guys you guys hit it on the head..lol

I was gonna say ..do a reverse phine number lookup, if you use a reliable service you will have recent records. Some services records I have seen out of date by over a year, so make sure you check the accuracy disclaimer on the site.

Is it a cell number? Home number? If it is a cell number you might have a little harder time getting a number.

I have also googled phone numbers before, you will be suprised what you find sometimes :-)