Does anyone know of a way to find out the owner of a cell phone if you know their number? I see many sites for reverse lookups for cell phones but they charge almost 100 bucks.
All of the free reverse phone number sites have a fee after you put in the phone number. Anywho.com or whitepages.com or any of that stuff does not work since you have to pay to get a report.
Are there any ACTUAL free ones out there?

I haven’t looked into this, but I would guess there’s a reason why the services you’ve found are all for-fee services.  The biggest of which would be that they’re paying for the DB to begin with.

They are sort of an unlisted number

If you have a landline number, and don’t specifically ask for it to be unlisted, then it goes into the “White Pages.” Many cell services charge for incoming calls so listing the number could end up costing the owner/user money. Remember the flap a few months ago when some cell service providers wanted to market their data bases to all and sundry?

Do a web search on Google or whomever. If the number is for a business it may show up.