T-Mobile’s “Galaxy S26 Ultra On Us” offer will pull in high-intent upgrade shoppers—but “on us” only works when customers understand the requirements: eligible plan, trade-in condition, promo credit timeline, and how long they must stay to receive full credits. Dealers can win with a 10-minute “On Us Audit”: confirm plan eligibility, verify trade-in value/condition, explain when credits start, and write the steady-state monthly total down.