MS Teams Tools Free Plan is a way to give you a taste of what the platform can do. The Free Plan is free for life, but you will not be able to edit more than 1 user and 1 phone number range.
If you are happy with the functionality, then click on Orders and you will be able to upgrade your plan.
Be aware that there can only be 1 free plan per domain. An example would be the email email@example.com. The xyzcompany.com is the domain name.