See the post above yours; they do both. I'm in a building where Sonic is offered but it's through AT&T. I went with AT&T since the price was the same, would still need to rent AT&T's stupid PON device (which I bypass anyway), and Sonic mentioned that AT&T provided poor customer service for Sonic customers.

I'd love it if the fiber in the building was public so I could just pay 1/2 what I pay AT&T for Sonic instead.