Hi @Johnette Cotten ,
Indeed, this feature is not supported yet but your idea is helpful for most customers.
In my experience, admin can manage their phone number via PSTN Service Desk
I tried to read Microsoft Teams roadmap but did not find the valuable information about it.
In this case, we highly recommend you give your feedback in Teams UserVoice. You can vote for it here. (The link is: https://microsoftteams.uservoice.com/forums/555103-public/suggestions/42181024-change-pstn-phone-number-type-as-admin). Microsoft will always focus on customer’s feedback and experience, some new features would be added to the services based on customers' feedback in the future, and your good ideas will be very helpful for them to improve the service.
Your time, understanding and cooperation will be highly appreciated.
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