In the Case of Cellular Phones, the Physical Product Is

In the case of cellular phones, the physical product is practically given away to gain the phone services contract. This could be because:

A) the cellular phone company does not view market share as a strategic goal.
B) the cost of production of the cellular phone is very low.
C) the revenues from associated services exceed the revenues from the cellular phone.
D) the margins on after-sales services for the cellular phones is low.
E) consumers sometimes buy a variety of services that are not associated with products.