The DR Credit Website
I found one possible way to look up cell phone numbers. Unfortunately, it is a pay for service. I am not sure how well it works, but I just wanted to report back to the post since others have been asking.
I had a cell phone number in my hand today and I wanted to find the person behind the number. One of my coworkers was able to pull up the name of the person that owns the cell phone number I was looking for.
I don't remember the exact website, but it is the Dominican version of equifax/trans union/experian (the USA credit bureaus). From what I understand, most banks and lenders use this service to evaluate potential clients. Companies can even buy the service to check potential employees.
If you can find someone with access, they may be able to help. I am not sure how well it works for new numbers and how up to date the information is, but if the person you are after has had the number for some time and has some type of credit history, it may be possible.