I spent close to forty minutes at a phone counter last spring, waiting while a friend signed a contract, and nobody at that table ever said a total. The salesperson said a monthly figure, then a smaller monthly figure, then a smaller one again, and each drop was tied to something my friend agreed to on the spot. A trade-in credit pulled the number down, and a higher tier plan pulled it down further, because a larger discount was attached to that tier. My friend left holding a phone and a folded printout, and the only figure he repeated on the walk out was the last monthly one.
The structure of that conversation was doing most of the work, and the structure is simple enough once it is laid out flat. The device price and the plan price arrive fused into a single monthly line, so any change to one shows up as a change to the other. That fusion makes the plan look cheap whenever the handset subsidy is generous, and it makes the handset look cheap whenever the plan tier is high. Neither impression survives once the two amounts are separated and then rebuilt into one figure covering the entire contract term.
A full cost breakdown of the two routes runs the arithmetic in one direction, taking the device price actually paid and adding the monthly charge multiplied by the months committed. Buying outright versus bundled becomes a real comparison only after both sides are expressed that way, over two years or whatever term the paperwork specifies. Installment fees sit inside that multiplication and rarely surface at the counter, along with the plan tier the contract requires and the add-on services attached for the first few months. The monthly figure my friend heard was accurate, and it was also incomplete in a way that would take him two years to feel.
The counter has no strong incentive to present the combined figure, though nobody at that table seemed to be concealing it, since monthly framing is how the whole display is priced and compared. What a store optimizes is the moment of agreement, and one small number reaches that moment faster than a table with four columns. Since the subsidy rules loosened, the same handset can carry several different totals depending on which discounts stack together, and the person quoting a monthly figure has not necessarily run that multiplication. Which combination actually lands lowest depends on the plan a buyer would have chosen anyway, and that calculation runs in the opposite direction from the one the display is built around.