"(b)" sounds more like it, Sasha, as "(a)" is not always easy or expedient -- and what then, a secondary market in "pre-owned cell phones" ?! I say, it is simple: all these tie-ins, loss leaders and contract clauses only obscure the picture.
Physical phones cost something, but much much less than current nominal prices -- hey, asking price for my BlackBerry was higher than for the laptop I'm writing on . Providing phone, wifi, internet access etc. also costs something, but is remarkably elastic -- witness the last-ditch offers when you decide to close and account and move to a competitor. What I and others in this thread are saying is, let us keep the two separate, independent, and out in the open, where compertition may work its magic.
BTW, I didn't pay almost $400 for my Berry. Apparently no one else did either (thank you!); it ended up on sale at Comp USA and I bought it for $100 with NO obligations attached. See?