Is there really no PgDn on a phone?!? I don't use them, but that is surprising! I would program one of my theoretical phone's physical side buttons to handle P

Is there really no PgDn on a phone?!? I don't use them, but that is surprising! I would program one of my theoretical phone's physical side buttons to handle PgDn/PgUp [†] – similar to my old Kindle's layout. Do phones still have side volume buttons (e.g.)? [†] Thanks for the better styling, than my former Page_Up &c