It never ceases to amaze me how companies choose the worst software!
> I have tried most of them: Google Meet, Teams, Slack, Discord, Skype, Jitsi and so far I liked Jitsi the most and Skype the least.
We clearly live in very different bubbles
> digital/fiber/whatever
VoIP
> cheaper than paying multiple cell bills
Nobody pays multiple cell bills unless they wanna use several data-only eSIMs from different carriers to get better speed/coverage. If you just want a lot of phone numbers, you can port your numbers to a VoIP provider and forward them. Way cheaper than a landline