Team Chat without Voice

[CKauffman]

We have not migrated our company phone to Teams Voice.  We are still using Skype for Business for voice and chat.  I am told that it is not possible to enable Teams Chat without moving to Teams Voice as well.  Is this true?  Are they inseparable in the ability to roll out one without the other?

[#2]

Well, to be fair the options you have are described here: https://docs.microsoft.com/en-us/microsoftteams/setting-your-coexistence-and-upgrade-settings

[#3]

That is fair indeed. If you were to answer my question would you recommend islands mode?