Hi Not sure if it's a free or paid version.
However it still appears and functions on my windows mobile client (not windows mobile by choice ) . And I am on the Freemium Spark version. But considering the only difference between freemium version and M1/C1/Business messaging is the fact you can enable hybrid services and administer users via a portal I would suggest that it would be available in the free version.
This is just my opinion, which probably counts for very little since I don't work for Cisco
Teams feature has been released today, you can read more about it here -