As other leading smartphone makers are perfecting devices with vertically or horizontally folding screens, recently published patent information suggests Cupertino might take a different route. A patent for “electronic devices with rollable displays” filed last October and published on July 13 references a device with a display that could be moved between an unrolled state where it is planar and a rolled state for storage.
Considering the new EU regulation requiring removable batteries, depending on how it’s done by companies I’m thinking therea a decent chance you could get an extra large battery that can connect to it, then have a custom backing to close it. BRING THE DAYS OF THE BRICK BACK