Private DNS protects you when you browse the internet and use apps on your phone. It:
Your phone is set to Private DNS > Automatic by default. So, as long as your mobile or internet service providers offer encrypted DNS, you're protected. Check with your mobile and internet providers.
The only time you need to change this setting is if you have a free or paid DNS service to use, instead of relying on your mobile or internet providers. To add the service to your phone:
If you no longer want to use the private DNS service:
Select Automatic.
We don't recommend turning Private DNS off.