They do this already, at least with Fry's. The problem is that the REAL price of a cell phone is higher than most people expect, and the carriers play stupid games to "discount" a phone by getting you into an overpriced 2 year contract. Of course, you'll effectively pay for it and then some, and bringing your own you get no discount. Lack of device portability across US carriers and contracts with punitive ETFs inhibit the ability for the end user to actually shop for deals.