King2020, value your concern. Typically, there is no need to change your plan when doing a standard upgrade. In some cases, there are plan requirement to achieve the advertised promotional pricing. This would be disclosed where you are viewing the pricing. Does this help?
We definitely understand where you're coming, and we appreciate your time. We do try to ensure all details and requirements for promotions are available online on the page with the new phone, including any plan requirements.