If you are in a meeting just click "Invite People" and type a phone number - it will call them. We have the "Team for Business". Whatever that means.
They will almost assuredly not answer because its an 800 Number, and requires them to press [n] to join call. But you can do it.
If you don't have a meeting just make one with only you - Which is coincidentally a great way to fill a calendar, and look busy to your coworkers. They ignore Busy status. When I'm in a "meeting", it doesn't even ring when they bother me.
They are offered to everyone. I'm not sure why you think that is a bad thing.
It is typically free if you have any kind of insurance.