14 iPhone 12 Settings to Change Immediately for Better Performance

Apple's defaults assume you want all features enabled, all notifications visible.
Most iPhone 12 owners never adjust their settings, leaving battery-draining features active by default.

Each new device arrives carrying its manufacturer's assumptions about how we want to live — assumptions that may not match our actual lives at all. The iPhone 12, powerful and capable as it is, ships with factory defaults optimized for a general user rather than any particular one. In the weeks following its December 2020 release, thoughtful observers noted that a small investment of attention — adjusting a dozen or so settings across battery, privacy, display, and notifications — could meaningfully close the gap between what Apple imagined and what each owner actually needs.

  • Factory defaults quietly work against the user: 5G constantly searches for coverage that may not exist, draining battery without delivering any benefit in return.
  • Notifications have been redesigned in iOS 14 to be less intrusive, but the tradeoff is that incoming calls and alerts are now easy to miss entirely.
  • The iPhone 12's OLED screen turns dark mode from a style preference into a genuine power-saving tool, yet most users leave it switched off.
  • HDR Dolby Vision video looks stunning on Apple devices but uploads as washed-out footage to Instagram and Facebook, creating a quiet trap for anyone who doesn't know to look for it.
  • Privacy permissions accumulate silently during setup — location, photos, health data — handed over in haste to apps that may not need them at all.
  • A focused session of fifteen to thirty minutes across Settings can realign the device with the owner's actual habits, sleep schedule, and data plan.

You've just unboxed your iPhone 12, and it's already working against you in ways you won't notice until later. Apple's factory settings are built for a hypothetical average user — not for you specifically — and a few quiet defaults are quietly costing you battery life, sleep, and privacy before you've sent your first message.

Begin with 5G. Apple's Smart Data feature sounds clever: it switches automatically between 4G LTE and 5G depending on what you're doing. But if reliable 5G coverage doesn't exist where you live, the phone spends energy searching for a network that isn't there. The fix is simple — navigate to Cellular > Cellular Data Options > Voice & Data and lock it to LTE. If you do have solid 5G, it's still worth checking the data mode options in that same menu, which control how aggressively the phone uses the faster connection.

Notifications deserve attention next. iOS 14 changed incoming calls from full-screen takeovers to small banners at the top of the display — easy to miss. You can restore the old behavior in Settings > Phone > Incoming Calls. While you're there, consider whether your lock screen should show message previews to anyone who glances at your phone, or only after Face ID confirms it's you.

Dark mode is more than aesthetics on the iPhone 12. Because the screen uses OLED technology, true black pixels are simply switched off, consuming no power at all. Enabling dark mode in Settings > Display & Brightness produces a real, measurable improvement in battery life. Disabling auto-brightness — buried in Settings > Accessibility > Display & Text Size — and managing brightness manually through Control Center can extend things further.

Do Not Disturb, scheduled to silence the phone during sleep hours, is one of the most underrated settings on any iPhone. It ships disabled, meaning every late-night email and social notification will reach you. A simple schedule keeps the phone quiet while you sleep, with the option to let repeated calls from the same number ring through for genuine emergencies.

The camera's new HDR Dolby Vision recording is genuinely impressive, but it creates a hidden problem: most social platforms don't support it yet. Video uploaded directly to Instagram or Facebook will look flat and washed out. You can disable HDR recording entirely, or leave it on and share through the Photos app, which converts automatically before uploading.

Finally, spend a few minutes on the things that accumulate quietly: home screen organization using iOS 14's new App Library, Control Center shortcuts tailored to what you actually use, and — most importantly — privacy permissions. During setup, it's tempting to approve every app request just to keep moving. It's worth going back and reviewing exactly which apps can see your location, your photos, and your health data. That review takes minutes. The peace of mind lasts considerably longer.

You've just unboxed your new iPhone 12. It's sleek, it's fast, and it's ready to go. But before you settle into using it, Apple's factory settings are working against you in ways you might not immediately notice. The good news is that a handful of quick adjustments—most taking just a minute or two—can transform how the phone performs and feels in your hands.

Start with 5G. Apple's new lineup was the first to support the faster network standard, and the company has built in a Smart Data feature that automatically switches between 4G LTE and 5G depending on what you're doing. Sounds smart. In practice, if you live somewhere with spotty or nonexistent 5G coverage, the constant searching drains your battery faster than it should. If that's your situation, turn 5G off entirely. You can always flip it back on later. The setting lives in Cellular > Cellular Data Options > Voice & Data, where you can force the phone to use LTE only. If you do have reliable 5G, check your data mode settings in that same menu—you'll find three options controlling how much data the phone uses on 5G connections, from allowing maximum data for high-quality video and FaceTime to a low-data mode that restricts everything. Your carrier and plan will set a default, but it's worth checking that it matches what you actually want.

Next, notifications. iOS 14 changed how incoming calls appear on your screen. Instead of taking over the entire display like they used to, they now show up as a small alert at the top—easy to miss if you're already using your phone. If you want the old full-screen behavior back, go to Settings > Phone > Incoming Calls and select Full Screen. While you're in notifications, consider whether you want to see the full content of messages and alerts on your lock screen. Face ID hides them by default for privacy, but you can change that in Settings > Notifications > Show Previews, choosing Always if you want to see who texted you without unlocking the phone.

Dark mode deserves its own paragraph. It's not just an aesthetic choice. Because the iPhone 12's screen uses OLED technology, displaying black actually uses less power than displaying white. Turn it on in Settings > Display & Brightness, and you'll see a measurable improvement in battery life. Apple's own apps will switch immediately, and most third-party apps have followed suit. While you're adjusting the display, consider disabling auto-brightness. By default, your phone automatically adjusts screen brightness based on ambient light, but this can drain battery faster. Turn it off in Settings > Accessibility > Display & Text Size, and manually control brightness through Control Center instead.

Do Not Disturb is perhaps the most underrated setting on any iPhone. Out of the box, it's disabled, which means your phone will beep and buzz all night long—notifications about emails, social media, everything. Enable it, and you can set a schedule so your phone silences automatically when you sleep, then wakes up again in the morning. Your notifications will still be waiting, but you won't be jolted awake at 2 a.m. by a work Slack message. You can even allow repeat calls from the same number to ring through in case of emergency.

The camera on the iPhone 12 can now record HDR video with Dolby Vision, which produces brighter, more colorful footage with better contrast. The catch: most apps and services don't support it yet. If you upload an HDR video to Instagram or Facebook directly from the app, it will look washed out and lose its punch. You have options. You can turn HDR video off entirely in Settings > Camera > Record Video. Or you can leave it on and use the Photos app to share instead—it will automatically convert to standard dynamic range before uploading. If you send the video to another iPhone user, Apple will detect whether their device can handle HDR and convert automatically if needed.

Home screen clutter is easy to accumulate. iOS 14 introduced the App Library, which acts like an app drawer, letting you hide apps without deleting them. Decide whether you want new apps to automatically land on your home screen or go straight to the App Library. You can also customize your wallpaper to switch between light and dark versions automatically—look for the half-black, half-white circle indicator on wallpaper previews. Control Center, that menu you pull up from the top-right corner, can be customized too. Add or remove shortcuts to features you actually use, whether that's the flashlight, low-power mode, or your wallet. Finally, spend a few minutes on privacy. When you first set up your phone, you're bombarded with permission requests from apps. It's tempting to approve everything just to move forward, but take time to review what each app can access—your location, your photos, your health data. You're in control here.

These adjustments won't take long, but they'll make a real difference in how your iPhone 12 behaves and how you experience it every single day.

If you don't want to sacrifice battery life for faster 5G speeds, shut it down. You can always turn 5G back on when you want it.
— CNET's iPhone 12 settings guide
Dark mode converts all of the white backgrounds in apps to, more often than not, a black background. In turn, your phone is able to save battery power thanks to the darker colors.
— CNET on dark mode benefits
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Inventor

Why does Apple ship these phones with settings that work against the user?

Model

It's partly about appealing to the broadest possible audience. The default settings assume you want all features enabled, all notifications visible, maximum brightness. But that doesn't match how most people actually live.

Inventor

The 5G thing seems like it should be obvious—if there's no 5G where you live, why would you leave it on?

Model

Because most people don't think about it. They see "5G" and think it's good, so they leave it alone. But the phone is constantly searching for that signal, and that searching costs battery. It's a hidden drain.

Inventor

Dark mode saves battery? That seems almost too simple.

Model

It's physics. On an OLED screen, black pixels are actually off. White pixels are on and consuming power. So a dark interface literally uses less electricity. It's one of the few settings changes where you get both the thing you want—a look you prefer—and a tangible benefit.

Inventor

The Do Not Disturb thing sounds like it should be on by default.

Model

You'd think so. But Apple defaults to letting everything through. They assume you want to be reachable. The reality is most people would sleep better if their phones were quiet at night, and they'd still get the messages in the morning.

Inventor

What about the HDR video issue? That seems like a real problem.

Model

It is, but it's temporary. Developers will update their apps. For now, it's a mismatch between what the hardware can do and what the software ecosystem supports. The workaround—using Photos to share instead of the app itself—is clunky but it works.

Inventor

So really, this is about taking control back from the defaults.

Model

Exactly. Apple sets these phones up for a generic user who doesn't exist. The moment you spend ten minutes in settings, you're making the phone yours.

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