10 Hidden Mobile Settings You Didn't Know Existed

My phone's battery used to die by 4 PM every single day. I blamed the battery health, blamed the apps, even blamed myself for "using it too much." Turns out, I had a setting turned on that was quietly running a background scan every few minutes. One toggle. That's all it took to fix it.

That's when I started digging through my phone's settings menu like it was a treasure hunt. And honestly? I found stuff that felt like cheat codes. Some of it saved my battery, some of it saved my sanity, and one setting literally stopped a random app from listening in on my mic without me knowing.

So here's the list I wish someone had handed me years ago. These work mostly on Android (I use a Samsung and have tested on a Pixel too), but I'll point out the iPhone equivalents where they exist.

1. App Battery Usage Limiter (Android)

Go to Settings > Battery > Background usage limits. There's an option to put apps to "sleep" or "deep sleep" so they stop running in the background when you're not using them.

I did this with a food delivery app I only open twice a week. It was quietly refreshing location data every 10 minutes. After I restricted it, my battery drain from background apps dropped noticeably — I checked the battery usage graph a week later and it was a completely different shape.

Mistake I made early on: I put my messaging app on deep sleep too, and missed a few notifications for almost two days. So be selective. Don't just restrict everything blindly.

2. Private DNS (Android) / Encrypted DNS (iPhone)

This one sounds techy but it's not. Go to Settings > Connections > More connection settings > Private DNS on Android. On iPhone, it's a bit buried, but you can set it up through a configuration profile or certain VPN-free apps.

Setting this to something like Cloudflare's DNS (1.1.1.1) made websites load a little faster for me, and it blocked some sketchy ad-trackers before they even loaded. I noticed fewer of those annoying "your device has a virus" popup ads on random websites.

3. Sound & Vibration – Adapt Sound (Samsung specific, but similar exists on Pixel)

Buried under Settings > Sounds and vibration > Sound quality and effects, there's a hearing test that actually adjusts audio output based on your hearing profile.

I tried this thinking it was gimmicky. It wasn't. Music sounded noticeably clearer through my earbuds afterward, especially in the higher frequencies. If you listen to music a lot, this is worth the two minutes it takes.

4. App Permissions – "Ask Every Time" for Mic and Camera

This is the one that actually made me a little uneasy. Under Settings > Privacy > Permission manager > Microphone, you can set individual apps to "Ask every time" instead of "Allow all the time."

I found three apps had standing permission to my microphone that I never remembered approving — probably clicked "Allow" too fast during setup, like we all do. Now I get a quick popup asking every time an app wants mic access. It's a tiny bit annoying but worth the peace of mind.

On iPhone, it's under Settings > Privacy & Security > Microphone, and you can just toggle apps off individually instead.

5. Developer Options – Reduce Animation Speed

Go to Settings > About phone, tap "Build number" seven times (yes, actually seven, I miscounted twice and had to redo it), and you'll unlock Developer Options.

Inside, there's Window animation scale, Transition animation scale, and Animator duration scale. Set all three to 0.5x instead of 1x.

This doesn't change anything technical about your phone's speed, but it makes it feel faster because the animations happen quicker. I did this on my mom's older phone that felt sluggish, and she asked me what I did to "upgrade" it. I didn't have the heart to tell her it was just animation speed.

6. One-Handed Mode

Buried in Settings > Advanced features > One-handed mode (Samsung) or Settings > Accessibility > Touch > Reachability on iPhone.

I have average-sized hands but a phone that's basically a small tablet at this point, and reaching the top corner of the screen one-handed while holding a coffee was a daily struggle. This shrinks the screen down to a corner so you can actually use it with one thumb.

Small thing, but once you turn it on, you'll wonder why it's not on by default.

7. Data Saver + Background Data Restriction Per App

Under Settings > Connections > Data usage > Data saver, you can turn this on globally, then whitelist specific apps that are allowed to use data freely in the background.

I travel a fair bit and used to burn through my roaming data without realizing which app was the culprit. Turned out it was a weather app updating radar maps every few minutes, even when closed. Restricting background data for that one app alone extended my data plan noticeably on a recent trip.

8. Lockscreen Notification Content Control

Go to Settings > Notifications > Lock screen notifications. You can choose to show content, hide content, or not show notifications at all on the lock screen — app by app.

I learned this one the hard way. A friend was scrolling through photos on my phone once when a rather personal message notification popped up on the lock screen, fully visible. Mortifying. Now sensitive apps are set to "hide content" so only the app icon shows, not the message itself.

9. Bixby / Assistant Button Remap (or disable it entirely)

If you've got a Samsung phone, there's a good chance you've accidentally opened Bixby by gripping your phone wrong. For years I just lived with it.

Under Settings > Advanced features > Side key, you can remap that button to open the camera, take a screenshot, or literally do nothing. I set mine to open the camera with a double press, and now that "accidental button" actually saves me time instead of wasting it.

10. Battery Percentage in Status Bar

This feels too simple to be "hidden," but so many people don't know it exists. Settings > Notifications > Status bar > Show battery percentage.

I went years just guessing my battery level from a little icon shape. Turning on the exact percentage number changed how I manage charging completely — I actually plug in at 20% now instead of waiting for the phone to yell at me at 5%.

Common Mistakes People Make With These Settings

A few things I'd tell my past self before touching any of this:

• Don't restrict background data or battery usage for apps you rely on for real-time alerts (banking apps, messaging apps, ride-sharing apps). You might miss something important.
• Developer Options isn't dangerous to open, but avoid randomly toggling things you don't understand in there. Stick to what you're changing and leave the rest alone.
• Changing DNS settings can occasionally cause a website to load slowly at first — give it a minute before assuming it's broken.
• Always test one setting at a time. If you change five things at once and something breaks, you won't know which one caused it. I learned this after resetting my phone's animation settings, DNS, and permissions all in one sitting, and spent a confused hour trying to figure out why one app stopped loading.

Final Thoughts

None of these settings are secret in some conspiracy-theory sense — they're just buried three or four menus deep, in places most people never have a reason to tap into. But once you know where to look, your phone genuinely starts working the way you actually want it to, instead of just however it came out of the box.

Go ahead and poke around your settings app for ten minutes this weekend. Worst case, you learn your phone a little better. Best case, you find your own version of that battery-draining background scan I dealt with, and fix it before it ruins your afternoon.