“They” don’t want you to know this

Prompt:

Can a parent limit a kid’s screen time simply by tweaking some of the settings on the smart phone? Are these services available?

GPT Thinking answer:

Yes. On both iPhone and Android, a parent can limit a kid’s screen time largely through built-in settings (no extra app required), and there are also optional third-party services.

There is much more detail at the link.