One of the devices Apple is rumored to launch later this year includes an OLED ‘iPhone X Plus’. While the actual name of the device can still be debated, it seems quite likely that we will see a phablet sized 6.5-inch iPhone this year featuring a design similar to that of iPhone X. This 6.5-inch OLED iPhone was rumored to have a resolution of 1242 x 2688 pixels. Now support for this particular resolution have been found in iOS 12 beta, which seem to have confirmed the existence of this larger iPhone model.
The references found in iOS 12 beta not only point at a new screen resolution but they also suggest that the so called iPhone X Plus will feature an iPad-like landscape mode. When site iHelpBR ran iOS simulator tool in Xcode with iOS 12 at a resolution of 1242 x 2688 they discovered certain apps such as Calendar, Messages and Contacts are optimized for landscape orientation and react to the landscape mode similar to how they act on the iPad, as opposed to the 5.8-inch iPhone X that does not support iPad-like landscape mode on these apps. Plus sized iPhones such as iPhone 8 Plus do support iPad like landscape mode in some applications.
For example, when you run Messages app in landscape orientation you can see list of conversation threads on one side and the selected messages thread on the other. Similarly on Calendar app you get full monthly calendar on one side and list of events on the other.
With iOS 12’s support for 1242 x 2688 screen resolution one can certainly say that at least Apple has tested a iPhone X Plus internally and may very well end up releasing this particular device come September, giving fans of iPhone X design a device with larger resolution.