Hi @RuilzOperase-8620
Welcome to our forum!
Are you using the Teams client?
To use the dial-up feature or purchase a call point to build Teams Phone System, you'll need to have a business or business account with Microsoft 365, and your personal account doesn't yet have access to these features.
For more details about Phone system, you can refer to:
https://video2.skills-academy.com/en-us/microsoftteams/what-is-phone-system-in-office-365.
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