Where Can I Find a Quality Service for Free To Help Me Trace a Cell Phone Number?

I am sick and tired of harassing phone calls at all hours of the day or night. I answer, they hang up and this goes on and on for days. I’ve gone online and researched how to trace cell phone number but I don’t want to just settle for any free service. I want to know I’m getting my money’s worth. That’s when I found lookupcell.net. This is a free service that will give me the city where the number is coming from, the carrier and it can even tell me if the number is a cell or a land line. And it’s all for free! I was even able to test it out first by entering my own number, just to see if it worked.