The location of Apple's red end-call button is set to slightly move with upcoming iOS 17 updates to the phone app, so be wary of your thumb's muscle memory. As iPhone users know, the “End” button currently sits prominently away from other call options, in a center position towards the bottom of the screen. While a iOS 17 preview guide from Apple showed this new setup in June, renewed attention has increased as some explore beta versions of the software upgrade.