How to Harden Your iPhone Security

Your iPhone is already more secure than most phones out of the box. Apple does a decent job with sandboxing, encryption, and keeping the App Store relatively clean. But “out of the box” isn’t good enough. Not even close.

If you’re really serious about mobile privacy, we wrote a full guide on GrapheneOS - a de-Googled operating system for Pixel phones that’s basically the gold standard for phone security. But let’s be honest: most people aren’t going to buy a specific phone and install a custom OS. That’s a big ask.

Good news. You can make your iPhone seriously tough to crack without switching phones. Let’s walk through it.

Lock Screen and Passcode

Your lock screen is the front door to your phone. Let’s make it a vault door.

First things first: ditch the 4-digit or 6-digit PIN. Go to Settings > Face ID & Passcode > Change Passcode and switch to a custom alphanumeric passphrase. Why? A 6-digit PIN can be brute-forced in minutes with the right tools. An alphanumeric passphrase with letters, numbers, and symbols? That takes years. Huge difference.

Next, go to Settings > Notifications > Show Previews and set it to When Unlocked. Right now, anyone who picks up your phone can read your messages, emails, and two-factor codes right from the lock screen. That’s basically leaving your mail open on the kitchen table.

Disable Control Center on the lock screen too (Settings > Face ID & Passcode, scroll down). Someone could toggle your Wi-Fi or Bluetooth without unlocking your phone.

Now, about Siri. If you don’t actively rely on it, turn it off completely in Settings > Siri. Siri listens, processes your voice data, and Apple has had privacy scandals with contractors listening to recordings. Your phone works perfectly fine without it, and you eliminate an always-listening microphone.

Finally, enable Stolen Device Protection (Settings > Face ID & Passcode > Stolen Device Protection). This feature adds extra security when your iPhone is away from familiar locations. It requires Face ID or Touch ID for sensitive actions like changing your Apple ID password and adds a one-hour delay for critical changes. If someone steals your phone and knows your passcode, this buys you time.

Apple ID and Two-Factor Authentication

Your Apple ID is the master key to everything. iCloud, purchases, Find My, App Store, iMessage. If someone gets into your Apple ID, they basically own your digital life.

Make sure two-factor authentication is enabled. It should be on by default these days, but verify at Settings > [Your Name] > Sign-In & Security > Two-Factor Authentication. If you want a deeper comparison of different 2FA methods and why some are better than others, check out our login security guide.

Use a strong, unique password for your Apple ID. Not the same one you use for Netflix or your email. If this one gets compromised, everything falls.

Here’s something most people skip: set up a Recovery Key. Go to Settings > [Your Name] > Sign-In & Security > Account Recovery. A recovery key means only you can reset your account. Without it, Apple’s support team could theoretically be social-engineered into giving someone access. It’s rare, but it has happened. Write the recovery key down and store it somewhere safe offline.

iCloud and Data Protection

Here’s something that surprises most people: by default, Apple holds the encryption keys to your iCloud data. That means Apple can read your backups, photos, notes, and more. It also means they can hand it over to law enforcement if asked.

The fix? Advanced Data Protection. This enables end-to-end encryption for almost everything in iCloud, including backups, photos, notes, voice memos, and Safari bookmarks. Only you hold the keys.

Enable it at Settings > [Your Name] > iCloud > Advanced Data Protection. You’ll need to set up a recovery contact or recovery key first (which you should have from the previous step).

The trade-off is real though: if you lose all your devices AND your recovery key, Apple cannot help you get your data back. That’s the whole point. Nobody else can access it, including Apple. Make sure your recovery key is stored safely.

Two more iCloud features worth using:

Hide My Email generates random email addresses that forward to your real inbox. Use these for signups and online forms. If a service gets breached or starts spamming you, just delete that alias. Your real email stays hidden.

Sign in with Apple hides your real email from apps and websites. It’s better than “Sign in with Google” because Apple actually creates a unique relay address for each app. Use it whenever it’s available.

Safari and Browsing Privacy

Safari is actually one of the better browsers for privacy out of the box. But there are a few settings to tighten.

Intelligent Tracking Prevention is already on by default. Good. Leave it on.

Enable Hide IP Address from trackers at Settings > Apps > Safari > Hide IP Address. This prevents known trackers from seeing your real IP.

If you have iCloud+, turn on Private Relay. It works like a lightweight VPN specifically for Safari traffic. It won’t protect other apps, but it’s a nice extra layer for browsing.

Keep Fraudulent Website Warning turned on. It warns you about known phishing sites.

Now, go to Settings > Apps > Safari and turn off Search Engine Suggestions and Safari Suggestions. These features send your keystrokes to servers as you type. Every letter, in real time.

Consider switching your default search engine to a privacy-focused option like DuckDuckGo or Startpage. Google’s search is great, but every query becomes part of your advertising profile.

App Hygiene and Permissions

This is the big one. You can nail every other setting on this list, but if you have 150 apps with full permissions, it barely matters.

Minimalism is security. Only keep apps you truly need. Every extra app, especially free games and random utilities, is another door into your data. If you haven’t opened it in months, delete it. It takes seconds to reinstall something if you ever need it again.

When apps ask for permissions, stop tapping “Allow” on autopilot. Think about it for two seconds. Does a flashlight app really need your contacts? Does a food delivery app need “Always” location access? Almost never.

Here’s a practical permission audit:

Location: Go to Settings > Privacy & Security > Location Services. Switch apps from “Always” to “While Using” or “Never.” Most apps work perfectly fine with “While Using” and many don’t need your location at all.

Camera and Microphone: Check Settings > Privacy & Security > Camera and Microphone. Revoke access from anything that doesn’t absolutely need it.

Contacts: Many apps request access to your contacts just to upload your entire address book to their servers. Think about whether each app genuinely needs to see your contacts.

Tracking: Go to Settings > Privacy & Security > Tracking and turn off Allow Apps to Request to Track. This tells all apps “no” by default, without even bothering you with the popup.

Clipboard: iOS shows a little banner at the top of your screen when an app reads your clipboard. Pay attention to it. If you just copied a password and an app immediately reads your clipboard, that’s suspicious.

Bluetooth: Many apps request Bluetooth access not for actual Bluetooth features, but for tracking. Shopping apps and retail apps are notorious for this. Deny it unless you know why they need it.

Make it a habit to review your permissions every few months. Apps sneak in new permission requests with updates, and you might have granted something months ago that you’ve forgotten about.

Communication and Messaging

iMessage is end-to-end encrypted between Apple devices. That’s already solid for everyday conversations. The weak link is when you’re texting someone on Android, as those messages fall back to SMS or RCS, which isn’t the same level of encryption.

For ultra-sensitive conversations, Apple offers Contact Key Verification (Settings > [Your Name] > Contact Key Verification). This lets you verify that your iMessage conversation hasn’t been intercepted. It’s a bit like Signal’s safety numbers. Overkill for most people, but good to know it exists.

Enable Mail Privacy Protection at Settings > Apps > Mail > Privacy Protection. This hides your IP address from email senders and blocks tracking pixels. Those invisible little images in emails that tell senders when you opened their message, where you were, and what device you used? Blocked.

If you want truly private messaging beyond iMessage, check out our comparison of Signal and Session.

Lockdown Mode

This one is for journalists, activists, or anyone who might be a target of sophisticated attacks. It’s not for everyone, and Apple is upfront about that.

Lockdown Mode (Settings > Privacy & Security > Lockdown Mode) dramatically shrinks your phone’s attack surface. It blocks most message attachments, disables some web technologies, blocks unknown FaceTime calls, blocks wired connections when locked, and removes shared albums.

It trades convenience for security. Websites may look broken, some features won’t work, and certain apps might behave differently. But if you’re in a situation where a state-level actor might target your phone, this is what you turn on.

Daily Habits and On-the-Go Security

Settings are great, but habits matter just as much.

Turn off Wi-Fi and Bluetooth when you’re out. Your phone constantly probes for known networks and broadcasts Bluetooth signals. This can be used to track you or to trick your phone into connecting to a rogue network. Only turn them on when you actively need them.

Use Airplane Mode when you need maximum privacy. At sensitive meetings, protests, or border crossings, airplane mode stops all radio communication and location tracking. It’s the closest thing to “going dark” without turning off your phone.

Think twice about Apple Pay. Linking payment cards to your phone means your spending habits are connected to your device. If your phone is ever compromised, your cards are exposed too. The convenience is nice, but keeping your phone and your wallet separate reduces your risk.

Keep iOS updated. Apple patches zero-day vulnerabilities fast, and attackers exploit them faster. Enable automatic updates at Settings > General > Software Update > Automatic Updates and install them promptly.

Don’t jailbreak your iPhone. Jailbreaking removes most of the security protections iOS provides. The walled garden is annoying sometimes, but it’s also what keeps your phone safe.

Use a password manager and enable passkeys wherever possible. Reusing passwords across apps and websites is still the number one way people get hacked.

Be skeptical of “free” apps that ask for too many permissions. If the app is free and the company isn’t a charity, you’re the product. Your data is how they make money.

Bottom Line

You don’t need to do everything on this list today. Start with the highest-impact changes: enable Advanced Data Protection, audit your app permissions, and fix your lock screen settings. Those three alone put you way ahead of most people.

Come back to this guide every few months and tackle a few more items. Security isn’t a one-time setup. It’s a habit.

And if you ever decide you want to go even further, our GrapheneOS guide is waiting for you. But for now, your iPhone just got a whole lot tougher to crack.