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At risk of beating the dead horse given that many people move and never change their cell phone number, we do find co-workers often times have their phone number. I have had good results with this company. https://www.pbinfo.com/ I will admit the best results we back in the day when the IRS would forward letters. They made that part of their service for you. But still in the past few years they have found some hard to find people and found people who were dead (which I think you can do on your own if you know how). The thing I like the most about them is if you ask for a letter from them they will send you one outlining the process of the search. That helps document you did your due diligence in case the DOL comes a knocking.