A built-in function on iPhones allows

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Application on a smartphone and linking a child's account, parents will know where the child is, whether he or she is skipping classes and when he or she returned home. Additionally, you can connect notifications about the child's exit from a section, school, or children's art center.

Advantages:

tracking the time the child spends on the Internet;
viewing applications that he or she is going to download or is already viewing;
prohibition on downloading suspicious content;
remote blocking of the smartphone;
no access to the popular video hosting for children under 13 years old.
What smartphones does it work on: Android, iOS.

"Locator"
you to track the location of relatives who also have "apple" smartphones. Shows in real time where they are and helps to build the shortest route. Additional options: push notifications mailing list opportunity seekers about the arrival and exit of children from certain places (for example, clubs and sections).

Advantages:

full control over actions and movements;
additional function "Screen Time" shows which websites the child opened, how many times the phone was picked up, how long the screen was active;
parents can create "white" lists of online services and programs;
define contacts with whom you can communicate;
set time limits for certain applications.