First Open Truecaller website.
Now select your country and then put your 10 digit mobile number in the search bar.
After entering mobile number, sign in with facebook / Google/Yahoo account to trace the unknown mobile number.
After successful Sign,you can easily trace any mobile number location with owner name.




Trace mobile Number Through Truecaller SMS Service
. If you Don't have Internet Data to check that unknown number on your phone Then Don't Worry TrueCaller also provide SMS service to trace any mobile number location with Name,operator and Andress.

For tracing any mobile number location Type SMS “Trace < 10 digit mobile number Which u want to trace> and send to 54444.
Now After sometime You wil get reply From truecaller with his Name, Service provider and it’s location.

For Example – If you want to trace location of mobile number 987654321 then just type SMS Trace 987654321 and send to 54444

Normal SMS charges may apply.

Source: http://www.techknow.com.ng/2017/06/step-by-step-guide-on-how-you-can-track.html?m=1