Easy way out is that Apple gets the phone profit from sales in the Apple store, plus AT&T's monthly/yearly/(customerly?) tax paid to Apple for the privilege of

Easy way out is that Apple gets the phone profit from sales in the Apple store, plus AT&T's monthly/yearly/(customerly?) tax paid to Apple for the privilege of being the only service, plus AT&T probably buys the phones from Apple. That leaves, for AT&T, the subscription fees, and maybe a little profit from phones sold in store?