iPhone Settings to Change First: Battery, Privacy, Security

The most useful iPhone settings to change first are Stolen Device Protection, Screen Unknown Callers, a battery charge limit, tighter app tracking and location permissions, and quieter notifications. Each takes under a minute. The menu paths below are for iOS 26 and iOS 27; names can shift slightly between versions, so use the search bar at the top of Settings if something isn’t exactly where described.

Security settings

1. Turn on Stolen Device Protection

If a thief learns your passcode, Stolen Device Protection stops them from changing your Apple Account password or turning off Find My without Face ID or Touch ID, and adds a one-hour delay for some changes when you’re away from familiar locations.

Open Settings > Face ID & Passcode (or Touch ID & Passcode) and enter your passcode.
Tap Stolen Device Protection and turn it on.

It requires Find My to be on. Apple explains the details in its Stolen Device Protection guide.

2. Use a stronger passcode

A six-digit code is the minimum; a longer custom code is better. Go to Settings > Face ID & Passcode > Change Passcode > Passcode Options. Avoid birthdays and repeating digits, and don’t type your passcode where people can see it.

3. Limit what works on the Lock Screen

Under Settings > Face ID & Passcode, scroll to Allow Access When Locked. Consider turning off Control Center and Accessories; with Control Center off, someone holding your locked phone can’t switch on Airplane Mode to stop it being tracked.

4. Make sure Find My is on

Go to Settings > [your name] > Find My > Find My iPhone and confirm that Find My network and Send Last Location are on. Our guide to finding a lost phone explains what to do if it goes missing.

5. Check your Apple Account security

Under Settings > [your name] > Sign-In & Security, confirm two-factor authentication is on, your trusted phone numbers are current, and consider adding a Recovery Contact. If you also want to tighten other accounts, see our guide to setting up passkeys.

Calls, messages and notifications

6. Screen unknown callers

Since iOS 26, the iPhone can answer calls from numbers not in your contacts and ask the caller for their name and reason before your phone rings.

Go to Settings > Apps > Phone.
Under Screen Unknown Callers, choose Ask Reason for Calling. The Silence option sends unknown numbers straight to voicemail instead.

Be aware that silencing can also catch calls you want, such as a doctor’s office or delivery driver. More options are in our guide to blocking spam calls.

7. Filter unknown senders in Messages

Go to Settings > Apps > Messages and turn on Screen Unknown Senders (called Filter Unknown Senders on older iOS versions). Texts from numbers you don’t know move to a separate list, which keeps scam texts out of your main inbox.

8. Cut notification noise

Go to Settings > Notifications and switch off alerts for apps you don’t need to hear from immediately.
Use Scheduled Summary to bundle non-urgent alerts into one or two deliveries a day.
On iPhones with Apple Intelligence, you can control AI-written notification summaries under Settings > Notifications > Summarize Notifications, including per app.
Set up a Focus under Settings > Focus for sleep or work.

Battery settings

9. Set a charge limit

On iPhone 15 and later models, you can cap charging below 100% to reduce long-term battery wear. Go to Settings > Battery > Charging and choose a limit such as 80%, 85% or 90%. The trade-off is less battery on a long day. Older models use Optimized Battery Charging in the same area of Settings instead. To read your current battery condition, see how to check iPhone battery health.

10. Try Adaptive Power

iOS 26 added Adaptive Power, which makes small performance adjustments when your usage is higher than normal. It’s available on iPhones that support Apple Intelligence (iPhone 15 Pro and newer) and is found under Settings > Battery > Power Mode. On some newer models it’s on by default.

11. Turn off Background App Refresh for apps that don’t need it

Go to Settings > General > Background App Refresh and switch off apps that don’t need fresh data the moment you open them, such as games and shopping apps.

Privacy settings

12. Stop apps from tracking you

Go to Settings > Privacy & Security > Tracking and turn off Allow Apps to Request to Track. Apps will then be told you’ve declined tracking across other companies’ apps and websites.

13. Review location access

Go to Settings > Privacy & Security > Location Services. For each app, choose Never, Ask Next Time or While Using the App, and turn off Precise Location for apps such as weather that only need your general area.

14. Run Safety Check

Settings > Privacy & Security > Safety Check shows who you share location, photos and other data with, and which apps have access to sensitive permissions. It’s a quick audit, and the Emergency Reset option is there if you ever need to cut off access fast.

15. Tighten Safari

Under Settings > Apps > Safari, check that Prevent Cross-Site Tracking is on, and set Advanced Tracking and Fingerprinting Protection to apply to all browsing if your iOS version offers it.

Quick reference

Setting	Where to find it	Why change it
Stolen Device Protection	Settings > Face ID & Passcode	Protects your account if someone learns your passcode
Screen Unknown Callers	Settings > Apps > Phone	Fewer spam calls
Charge limit	Settings > Battery > Charging	Slower battery wear (iPhone 15 and later)
App tracking	Settings > Privacy & Security > Tracking	Less cross-app tracking
Location Services	Settings > Privacy & Security > Location Services	Share location only when needed
Scheduled Summary	Settings > Notifications	Fewer interruptions

Bottom line

If you only change three things, turn on Stolen Device Protection, screen unknown callers and review which apps can see your location. Then keep your iPhone updated under Settings > General > Software Update with Automatic Updates on, since security fixes protect you more than any single setting.

FAQ

Will these settings slow down my iPhone?

No. Most are privacy and security switches. Low Power Mode and Adaptive Power may slightly reduce performance in exchange for battery life, which is their purpose.

Does Stolen Device Protection cause problems at home?

At familiar locations such as home or work, the extra delay usually doesn’t apply. You may still be asked for Face ID instead of your passcode for some actions.

Should I turn off Apple Intelligence?

That’s a personal choice. You can disable it under Settings > Apple Intelligence & Siri if you don’t use it or want to free up storage.

Why can’t I find a setting?

Apple sometimes renames or moves options between iOS versions. Swipe down on the main Settings screen and use the search field to find it by name.