We have several F1 users on our MS Phone System/PSTN Domestic calling plan. They are deskless workers, and are only using the Teams app on their mobile devices. They are setup as a "Teams Only" org.
We can't figure out how the F1 users can create their own voicemail greetings, or, for that matter, configure the voicemail settings that seem to be available in the desktop Teams app. They don't have computers nor do we want to have to ask them to "login to a computer" just to setup their voicemail - they are in the field and don't have access to computers (the whole reason why they're F1).