There is plenty of phone tracker apps available. However, we recommend a phone tracking app that is free. You can use it to find the details of a missing cell phone by tracking the mobile number. This app is one of the most reliable tools to find a number of locations and details within a matter of seconds. This tracker is very secure to use and no individual data or telephone numbers are stored in our database. All you need to do is to have the basic details of the SIM ( subscriber identity module) owner with you. Using the name and location of the SIM owner, Phone Tracker can easily trace the mobile number.