A. To ensure the app opens to the last read page, check if the app has a 'Remember Last Page' feature in the settings. If it does, make sure it is enabled. If not, try closing the app completely (swipe up from the bottom of the screen and swipe the app off the screen) and then reopen it. This can sometimes reset the app's memory of your last page.

B. If the above does not work, consider keeping a manual note of your last page read. You can use the notes app on your iPhone to jot down the page number before closing the app.