@Arlenes
Changing plan won't affect your rewards and loyalty, you will get the same reward amounts as before
But please try to use Change plan on renewal date option when you make plan change, if you are no rush of the new data or minutes.
With Change plan on renewal date, the plan change is scheduled on the next renewal date.
There is another option , Change plan now. With that, PM wiil charge you immediately the full amount of the plan (no rewards applied) for that one cycle. Also, unused days and data of the old cycle will be fufilled and no refund.
So, use Change plan on renewal date to save money
