In general, you can transfer any phone number that's from a supported provider, including:
- Land line phone numbers.
- Mobile device phone numbers such as those used for cell phone and tablets.
- Toll phone numbers.
- Toll-free phone numbers.
- Service phone numbers such as those used for conference bridges, auto attendants, etc.
- Fax phone numbers, but they can't be used for faxing. They have to be assigned to a user.
- VoIP phone numbers from a phone provider such as Vonage or RingCentral.
- Skype for Business hybrid phone numbers.
After you port your phone numbers over to Teams, Microsoft becomes your service provider and you can disconnect your service with your old service provider or carrier.
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