What is iPhone's Settings -> Cellular -> System Services -> General?

I have automatic updates turned off. I got the nag to update to 18.6 the other day and elected to install it overnight. Then I noticed that it was immediately downloading the update - presumably getting ready to install it at night.
This might be happening for some of the above cases - iOS downloads some (security?) updates “automatically” but holds off installing them?

I have long since done this I just checked and Automatic Updates are still turned off.

Nevertheless, another 600MB of mobile got chewed up yesterday.

Two more things to check, then, are:
Settings > Apps > App Store > Automatic Downloads
and
Settings > Apps > App Store > Cellular Data

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Link expired. Archive.is version - https://archive.is/vp2fE

Strange…in any case, here is the URL spelled out:
https://support.apple.com/en-us/101555
The information there was last updated in April 2025.

Perhaps there are regional restrictions on the page (that would be weird, no?) or proxy/VPN/ISP issues.

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