unknown icon

Can anyone tell me what the white icon is next to the phone?

That is the mountain goat symbolizing this rider holds the mountain route’s Epic KOM.

This is different than the Epic KOM jersey?

It’s the same, indicating the person who holds the Epic KOM jersey.

Thanks Scott.  If you know, why does Zwift use one vs. the other? 

This article I wrote from the Zwift Community Knowledgebase may help clear up confusion about that and other icons displayed in-game: 

What do the letters/symbols beside rider’s names mean?

I just noticed there’s a few new ones missing, I’ll backfill those (Mountain Leader and Challenge Rider)