Pixels Per Inch (PPI): What It Means & Why It’s Important


Pixels Per Inch (PPI): What It Means & Why It's ImportantPin

Pixels Per Inch (PPI) is a measurement used to define the resolution of a phone or tablet’s display. It can also be used to define the resolution of any kind of screen, however, including PC monitors and HDTVs. In the context of this post, we’re going to be looking at how it works inside mobile and tablet devices.

Pixels Per Inch is also sometimes referred to as pixel density. The higher a display’s pixel density, the higher its resolution is – QHD screens have a higher resolution (and pixel density) than 720p and 1080p displays. For instance, Apple’s iPhone 7 runs a 720p display. It’s small, so the pixels still aren’t visible, but when Apple moved to larger displays with the iPhone XS and iPhone XS Max, it had to up the pixel density to make the large displays look as good as possible. Therefore, it used QHD (quad-high-definition) and 1080p resolutions on these larger displays.

For a full breakdown of the differences between Apple’s iPhone display resolutions, you can check out our guide to Apple’s iPhone resolutions. In it, we cover all of Apple’s iPhones and their respective display resolutions – from the iPhone SE right up to the iPhone XS Max.

Why PPI Is Important

On modern mobile devices, as well as PCs and laptops, high resolutions are needed because the internet is now a visual medium. Web pages and social media networks use a lot of images and images look best on displays with high pixel densities. Gaming is another area where PPI comes into play. When you play a game, you want smooth, engaging visuals – not blockier, pixelated ones. With higher PPIs, you get less pixelization and improved gaming and viewing experiences, as you can see in the image below:

This is why Apple and Samsung, and pretty much everybody else in the mobile space, is now using OLED panels. OLED delivers better visual experiences than LCD. OLED is also brighter and has better contrast, which makes films, games, and the web look better. OLED is more expensive, however, and this is one of the chief reasons why smartphones have gotten much more expensive in recent years.

Latest Smartphone Releases


  • Xiaomi 15S Pro

    The Xiaomi 15S Pro didn’t come with a flashy launch, but it brings some seriously heavy hardware to the table. A custom 10-core chip, Leica-engineered cameras, and one of the brightest displays on the market

  • Samsung Galaxy S25 Edge

    At just 5.8mm thick, it’s one of the thinnest Android phones ever made—but don’t let the slim profile fool you. This phone is all flagship under the hood.

  • Nothing Phone (3a) Pro

    It’s got the same slick design and OLED display, but adds a periscope zoom camera and a 50MP front-facing shooter.

  • Nothing Phone (3a)

    The Nothing Phone (3a) nails the formula: give people what they actually want, keep the price low, and make it look cooler than anything else in its class.

  • Motorola EDGE 60 Pro

    With a bold design, flagship-like display, and surprisingly refined camera system, it’s one of the most interesting mid-range phones of 2025.

  • Google Pixel 9

    I’ve been using the Pixel 9 for a few weeks now, and honestly? It nails all the basics—and a bit more. Killer stuff all round!

  • Google Pixel 9 Pro

    I’ve used the Pixel 9 Pro as my daily device, and it’s hands-down the best balance of power, practicality, and photography you’ll find on Android right now.

  • OnePlus 13

    I’ve been using the OnePlus 13 as my daily driver for a few months now—and I’ve got to say, it’s easily one of the best Android phones I’ve tested this year.

  • Xiaomi 15 Ultra

    After using the Xiaomi 15 Ultra for over a week, I can confidently say: this phone is an absolute beast. It’s made for camera nerds, power users, and creators.

  • iPhone 16 Pro Max

    If you’ve been holding out for a truly complete iPhone, the 16 Pro Max delivers—hard. After using it daily, I won't be going back…

  • Google Pixel 9 Pro XL

    Big screen, big battery, and even bigger brains—this is the Pixel to get if you want Google’s best hardware and longest support.

  • Google Pixel 9a

    The Pixel 9a brings Google’s flagship-level smarts to a budget-friendly package, and it’s easily one of the best-value Android phones of 2025.

Best SIM-Only Plans & Deals


  • Boost Mobile Unlimited Premium Plan

    Boost’s top-tier option brings the heat: 50GB of premium data, hotspot, North America roaming, global talk & text, and $430 off select devices. All-in at $60/month with no contract.

    +

    Data: Unlimited (50GB premium speed)

  • Boost Mobile Unlimited+ Plan

    Level up with 40GB of premium data, hotspot access, global calling, and up to $300 in device savings. All for just $50/month. No contracts and flexible phone options included.

    +

    Data: Unlimited; Speed Caps After 40GB

  • Boost Mobile Unlimited Plan

    Start strong with 30GB of premium data, unlimited everything, and a killer intro offer: just $15/month for the first 3 months, then $25/month forever. No contracts. No fluff. Big value.

    +

    Data: Unlimited (Speed Caps Over 30GB)

  • iD Mobile 1 Month SIM-Only: 108GB

    Another high-data, low-cost option with no contract. 108GB for just £9, full 5G access, and the same goodies you get with 12-month deals.

    +

    Data: 108GB

  • iD Mobile 1 Month SIM-Only: 20GB

    The lowest price option. 20GB for £6 with all the same perks as pricier plans. Great if you don’t use much data and want to save every penny.

    +

    Data: 20GB

  • iD Mobile 1 Month SIM-Only: 110GB

    This plan gives you big data and zero commitment. 110GB for just £10 with all perks intact. If you need more data but want the freedom to cancel, this is the one.

    +

    Data: 110GB

  • iD Mobile 1 Month SIM-Only: 60GB

    More data, same price. For just £8/month, you get 60GB on a no-strings 1-month rolling plan. Ideal for users who stream often but don’t want long commitments.

    +

    Data: 60GB

  • iD Mobile 1 Month SIM-Only: 40GB

    Perfect if you want full flexibility. You get 40GB and all of iD Mobile's perks with no lock-in, annual increases, or setup fees. Great for short-term users.

    +

    Data: 40GB

  • iD Mobile 12 Month SIM-Only: 60GB

    One of the best pound-per-GB plans around. You get 60GB for £8 with £25 cashback, which means you’re effectively paying closer to £6/month. Includes roaming and data rollover.

    +

    Data: 60GB

  • iD Mobile 12 Month SIM-Only: 108GB

    This deal gets you a healthy 108GB of 5G data for less than a tenner, with no upfront costs and £24 cashback. All the perks are included too: data rollover, roaming, and loyalty rewards.

    +

    Data: 108GB

  • iD Mobile 12 Month SIM-Only: Unlimited Data

    This iD Mobile plan doesn’t just compete on price, it’s up there with the best of them. Unlimited everything, a year-long lock-in with no price rises, and £42 cashback straight to your pocket. It’s like getting nearly 3 months free.

    +

    Data: Unlimited, No Speed Caps

  • Mint Mobile 20GB Plan

    If you're looking to save some cash on your bills, this plan is an awesome option. You'll get 20GB of data per month and 20GB hotspot data allowance. For moderate to heavy users, that should be more than enough. I seldom use more than 10GB of data a month, and I'm always using my phone

    +

    Data: 20GB