The developer Instapaper, Marco Arment, says that a 4.94 "iPhone + is feasible and published some beautiful mockups about how it looks.
What would an iPhone Plus be like that used the Retina display of the iPad while keeping the resolution and design of the iPhone 5? With a resolution of 640 x 1136, 226 DPI and a size of 4.94-inches, it would look something like this next to an iPhone 5.
Arment notes that by keeping the same pixel dimensions as those of the iPhone 5, they would not need a change in apps, and using the handset with two hands would be easier because everything would be bigger.
One reason why Apple could think of releasing a larger iPhone is the increased demand for larger devices. Arment continued, comparing iPhone 5 and iPhone Plus to their competitors. As you can see in the picture below, iPhone 5 is very small compared to other devices.
Dimitrios Georgoulas @ GreekAppleNews