Not sure how their ISP works, but I pay a rental fee every month for my router, and the rep told me I'm welcome to change it out any time, all I have to do is t

Not sure how their ISP works, but I pay a rental fee every month for my router, and the rep told me I'm welcome to change it out any time, all I have to do is tell them it's broken. I'm not allowed to buy my own router, and most big ISPs in the US work the same way. So I'm just repeating what AT&T told me.