likely depends on the settings.
iphones i have set up use about 30MB per month for "System Services" dont know how much of that is from real usage vs. telemetry an stuff.
iphones i have set up use about 30MB per month for "System Services" dont know how much of that is from real usage vs. telemetry an stuff.
If there is any OS level telemetry it would fall under general which for my iPhone is 105MB in total since I activated it about a year ago. In general over a year+ (11 Pro Max) its 2.5GB with software updates and document sync accounting for over half of it both of which can be explicitly set to use WiFi only same goes for most other services as well.
Just to put things into perspective my total mobile data usage on this iPhone is 253GB, all system services is 1% of that.