Currently have ONE Plan with lnsider Discount. Do I still keep it if I change it to Experience More?

Will I keep my Insider Discount if I switch my plan from ONE to Experience More or do the newer plans require a different Insider Discount promo that's only available to new customers?

I did a test change plan to Experience More online and in the breakdown of the costs in the new plan has a section with a warning box that reads "Your old plan included: Insider Discount" and is not itemized in the breakdown while the Autopay Discount is. I thought it would transfer but just wanted to be sure.

Also had to spell "Insider" with an L in the title because it can't be submitted if you spell it correctly. Kind of hard to find answers about it in search due to that.