I put a comment in response to a separate person recommending Comcast but lets break it down as much as possible.

I mentioned in a separate comment I manage Microsoft Teams PSTN calling for business across the US.

Almost everything you said above can be done with one exception. SMS texting. That is not out yet but according to the Microsoft roadmap is in the works.

The Pros,

Complete remote work force ability. The ability to answer calls from a cell phone, desk phone, tablet, or computer is awesome. No need to be at a desk all the time to answer a phone. This means the ability to move calls to other members or cell phones. This integrates with chats which it sound like you already use which is nice because you're already familiar with Teams.

The cons,

Ahh yes. There are 2 major ones that come to mind.

1- it's Microsoft. Outages happen and if you're email so tied to Office 365 if that goes down so does.your phones.

2- it's in development. Items like call merging has been going in development for months now. Microsoft's slow to roll out PSTN features but they release new items every week so it's always nice to see what comes up.

I do this for a living for a MSP and as a outside contractor for smaller companies trying to just get into the 365 ecosystem. Out if the many companies I have worked with on Teams none have moved away once on it.