curiosity after reading your post made me want to check mine.
If I log into my account (I'm using a desktop computer so it may well be different on a phone or tablet). Then click on "About my plan" it takes me to a page titled "My tariffs and devices" and my rewards are visible on the right hand side of this page (I don't need to click on them or anything to see them).
Is this different for you?
____________________________________________________________________ If you just want to say thanks > click 'kudos'. If this has also helped answer your question > click 'helpful answer' also.