These Settings must be properly configured to keep Mobile Tracker Free working.
Info: A password may be required to access the application settings. If you have not changed, the default password is *1234*. More information about the application password here.
1) Settings => Battery => In the App Power Saving Mode Click on « DETAIL » button => Wi-Fi => Turn OFF
2) Settings => Data usage => MOBILE=> Set mobile data limit => Turn OFF
3) Settings => Data usage => WLAN => Wi-Fi => Application data usage => Restrict background data => Turn OFF