System Customization: Your iPhone will customize system appearance, behaviors, and settings using your current location, for example by automatically enabling Optimized Battery Charging when you are at home. This customization data does not leave your device.

Should I turn off system Services on iPhone?

There are a lot of System Services that always use in the background, most of them drains your iPhone's battery life and if you turn them off these system services will not affect your overall usage. You need to leave services such as Emergency Calls and SOS and Find my iPhone settings turned on.

Can I turn off system customization iPhone?

At the bottom of that tab is a selection called System Services. In the list that comes up you will find Significant places. At the top of that page, you will find the selection Significant Locations. Check this option to turn off the setting.