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Recently while browsing, I found a shortcut that's completely changed how I use Instagram. It's simple, and it works across all iPhone models, so you don't need the latest and greatest device to take advantage of it.
It's simple: Whenever Instagram shows you a grid of photos, and you want to take a closer look at one, instead of tapping on the photo, you should press and hold on the photo. Then, if you want to comment or like, simply swipe up.
Here's how it works: