How to Track a Mobile Number for Free
Several online services let you look up cell phone numbers. However, unlike landline numbers, cell phone numbers are not public information, so cell phone directories are rarely free. The few free sites that are available do not guarantee the accuracy of their information. However, you might be able to find what you are looking for.
Go to a website that offers free reverse cell phone search (see Resources).
Enter the cell phone number in question in the appropriate field, and click "Search."
Watch for the results.