This is a guide on how to trace a mobile number in Pakistan through the internet. Here are the steps:-

1-open google and enter the number in the search bar and click on search.

2-May be the person whose number you are tracing have used his number in making profile on social websites.

3-Try to search the number of all search engines like yahoo, bing, ask me. Google is the most powerful search engine, so you will find your desired result. Try to write the number with the person's name to maximize the possibilities of finding the person. 

This is also called Social engineering. The phenomenon is becoming very popular. Don't give your personal information on any site to make sure you remain anonymous.

If you find no results from above mentioned steps then you have to spend a fair amount of money to trace the number using several services online.