You can look up a cell?phone number by searching it on the internet. Google will help you find consistent information about a certain number if there is any. You can as well use the phone owner tracker to find information such as the area code and identify whether it is spam or not.
If you want to trace a phone number over the Internet, then you need to find the best website that can provide you information. You can also ask for recommendations as well. check this site http://goo.gl/mvs0H