In a similar question on answers.microsoft.com the OP sees the "Metered connection" switch in the mobile connection options, but it is disabled. A Microsoft representative says:
That UI toggle in the cellular page is deprecated and no longer used. We are aware of the confusion surrounding the toggle and are investigating a resolution. Thank you for your feedback and sorry for the confusion!
Given the current interface, "resolution" has consisted in removing the switch. But IMHO the confusion increases, since now we are unable to change the connection cost status, plus the UI is totally clueless about it.
As regard the
netsh command mentioned in my answer, strange as it may seem (in the same thread) a Microsoft wiki author discourages its usage, since:
there is, as yet, no published Command reference beyond the Windows 7 one so information is sparse. [The] command should not have been posted in this thread.
The suggested way for affecting the connection cost of the mobile connection consists in modifying values in the registry.
First, identify the registry key:
If you just want to know which is the status of your connection:
check the value names
DefaultMediaCost: if they are set to
1 the related mobile connections will be unmetered; a value of
2 sets the related connections to "metered". Expect to find a
1 as a value.
If you want to change the values named above:
note that the key
DefaultMediaCostis set by drivers and therefore the owner is the "TrustedInstaller" account. To be able to modify it, you need to right click on
DefaultMediaCost, choose permissions and set yourself as the
Owner through the dialog "Advanced" properties. Set the replace-subcontainers checkbox before applying the changes. Once you
Owner, set also
Full Control checkbox.
If you need to switch values often:
set them to metered, right click on
DefaultMediaCost and export them as a reg file. Set them to unmetered and export again. Double click on the metered/unmetered reg file as needed.
Note that modifications are per connection type and not per single connection.
Unfortunately the changes in
DefaultMediaCost require reboot, which makes inconvenient a scheduling of the peak/non-peak hour DefaultMediaCost`.
As regard data limits, based on the following Microsoft Guidelines, I infer that, under a variable or approaching data cap, the policy is to download only high priority Windows updates, but "allow users to explicitly [...] download lower priority updates".
@HeySora notes that Windows 1903 made 2 the default choice for both 3G and 4G networks, thus making cellular connections metered at each reboot