Sync.ME's database is made up of publicly available phone directories and Sync.ME user crowd sourcing !
Sync. ME database is constantly growing and getting smarter with each day. A number you search for today that provides no results, could be reported into the database tomorrow. Our database reacts in real-time to our users’ reporting and tagging, allowing us to expand the database on a daily basis. As well, numbers change owners frequently, and our users often help create a smarter database by suggesting name changes, which can take up to 72 hours to change in our database since they need to go through verification before changing officially.
You can delete your info here https://sync.me/optout/