The following steps show the process to purchase calling plans:
- You must first purchase a Phone System add-on license. To do that, sign in to the Microsoft 365 admin center and choose Billing> Purchase services > Add-on subscriptions > Buy now.
- After you buy Phone System licenses, you can buy the Calling Plan by sign in to the Microsoft 365 admin center and choose Billing > Purchase services > Add-on subscriptions, and then selecting Buy now. You'll see the Calling Plans there.
If you want to add a capability, buy one add-on license for each user who will use it. For more details about Microsoft Teams add-on licenses, you could refer to this link’s table.
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