When changing mobile plan, do we lose the upgrades and perks once the new plan takes effect ?

Hi,

You will keep all your upgrades as long as your plan is active. The same upgrades will be there every month even when your new plan takes effect.

Each time you reach a new level in the My Rewards program, you unlock a new upgrade. An upgrade is a long-term reward that boosts your plan every month, like additional mobile data or a monthly discount on the price of your Home Internet plan. https://fizz.ca/en/faq/what-do-i-receive-my-rewards-program