you’re able to change the resolution of your computer monitor on demand, so why shouldn’t the same logic apply to the display on your smartphone?
It seems like a ridiculous limitation, and if you were thinking along the same lines, then you might enjoy a freejailbreak tweakcalledUpscaleby iOS developersbd452andJulio Verne.

As you may have inferred from the tweak’s name, Upscale lets you change the resolution of your iPhone’s display. Above, you can see an example of my iPhone 6 running at stock resolution (left) compared with the native iPhone 6 Plus resolution (right); and for good measure, here’s another example:
If you couldn’t already tell, the iPhone 6 Plus sports a higher resolution, enabling more content to fit on your display at a glance. In fact, I’d even go as far as to say that it looks nicer than the iPhone 6’s native resolution.

Once installed, Upscale adds a preference pane to the Settings app where you may customize it to your liking:
Here, you can:
Upon tapping on a pre-set resolution, you’re prompted with an alert message that tells you what resolution you’re about to set and asks if you want to proceed; you may cancel at any time.
As you might come to expect, entering custom display resolutions isn’t recommended, and you use this feature at your own risk. In our testing, we were perfectly satisfied with the developer’s presets, and we think you will be too.

Do keep in mind that adjusting your display resolution to one higher than Apple’s native preset puts more stress on the device’s internal graphics hardware. That said, you could experience artifacts, lagging, orbatterydrain after applying a custom resolution.
If you’re interested in trying Upscale, then you candownload it for free from Julio Verne’s beta repositoryin Cydia. The tweak supports alljailbrokeniOS 11 iPhones and iPads.
What resolution will you be changing your iPhone to use? Share in the comments section below.