Not Free: Requires an additional subscription cost

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Key Limitation: Core Microsoft 365 business plans do not include phone numbers for PSTN calling by default.
Microsoft 365 Business Voice: This is a specific add-on subscription designed to provide cloud-based phone system features within Microsoft Teams for small and medium-sized businesses. Microsoft 365 Business Voice does include the option to obtain phone numbers (local or toll-free, depending on the region) for users. However, it is a paid add-on, meaning it incurs an additional cost on top of the base Microsoft 365 subscription. The phone numbers are part of this paid service, not offered for free.

Key Feature: Provides phone numbers as part of a paid subscription, finland phone number list enabling PSTN calling within Teams.
Microsoft Teams Phone (formerly Phone System): This is a more comprehensive phone system offering integrated with Microsoft Teams, typically included in higher-tier Microsoft 365 enterprise plans (e.g., E5) or available as an add-on. Teams Phone allows organizations to provision phone numbers for their users, enabling them to make and receive calls to and from the PSTN directly within the Teams client. Similar to Business Voice, Teams Phone is part of a paid licensing structure. The cost of the phone number is incorporated into the overall subscription fee for these plans or the add-on license.

Key Feature: Enables phone number provisioning and PSTN calling within Teams as part of paid enterprise plans or add-ons.
Not Free: Included in the cost of the higher-tier subscription or add-on license.
Azure Communication Services: This platform offers communication APIs and SDKs that developers can use to build custom communication experiences into their applications. Azure Communication Services allows for the programmatic acquisition of phone numbers for SMS and PSTN calling. However, these phone numbers are not provided for free. Azure Communication Services follows a pay-as-you-go pricing model, where users are charged for the resources they consume, including the rental of phone numbers and the usage of calling and messaging services.