iPhone Lockdown Mode is an extreme security setting in iOS that blocks most attack surfaces used by spyware like Pegasus from NSO Group. To enable it, go to Settings, then Privacy and Security, then Lockdown Mode, and tap Turn On Lockdown Mode. Your iPhone restarts with hardened protections that prevented even the FBI from accessing a locked device in a 2025 federal case.
Apple introduced Lockdown Mode in iOS 16 as a response to state-sponsored spyware targeting journalists, activists, diplomats, and lawyers. It is not designed for everyday use. It deliberately sacrifices convenience for security by disabling features that sophisticated attackers exploit. The feature is available on iPhone (iOS 16+), iPad (iPadOS 16+), and Mac (macOS Ventura+).
Understanding exactly what Lockdown Mode blocks, what it leaves functional, and whether you actually need it requires looking at the specific threats it addresses and the trade-offs it demands.
What iPhone Lockdown Mode Blocks vs What Still Works
Lockdown Mode does not simply add extra encryption. It fundamentally changes how your iPhone processes incoming data by disabling entire categories of functionality that attackers use as entry points. Here is the complete breakdown.
| Feature | Normal Mode | Lockdown Mode |
|---|---|---|
| iMessage attachments | All file types, link previews | Text only, no link previews, no attachments except images |
| FaceTime | Calls from anyone | Only from people you previously called |
| Web browsing (Safari) | Full JavaScript, JIT compilation | JIT disabled, some sites may break |
| Shared Albums | Full access | Disabled completely |
| USB connections | Connect to any device | Blocked when iPhone is locked |
| Configuration profiles | Can install MDM profiles | Blocked entirely |
| Wi-Fi | Auto-join known networks | Must manually connect each time |
| Phone calls | Normal | Normal (no change) |
| App Store | Normal | Normal (no change) |
| Camera | Normal | Normal (no change) |
| Apple Pay | Normal | Normal (no change) |
The most impactful restriction is disabling JavaScript JIT compilation in Safari. JIT compilers translate code at runtime and historically contain the most exploitable vulnerabilities in any browser. Disabling JIT eliminates an entire class of zero-click exploits but makes some JavaScript-heavy websites noticeably slower or non-functional.
Step-by-Step: How to Enable Lockdown Mode on iPhone, iPad, and Mac
Enable Lockdown Mode on iPhone or iPad
Open the Settings app on your device. Scroll down and tap Privacy & Security. Scroll to the bottom of the screen and tap Lockdown Mode. Tap Turn On Lockdown Mode, then tap Turn On & Restart to confirm. Your device will restart with Lockdown Mode active. The entire process takes about 60 seconds including the restart.
You need iOS 16 or later for iPhone and iPadOS 16 or later for iPad. Compatible devices include iPhone 8 and newer, iPad 5th generation and newer, iPad Air 3rd generation and newer, iPad Pro (all models), and iPad mini 5th generation and newer.
Enable Lockdown Mode on Mac
Open System Settings (or System Preferences on older macOS versions). Click Privacy & Security in the sidebar. Scroll down to find Lockdown Mode and click Turn On. Enter your administrator password and click Turn On & Restart. Your Mac requires macOS Ventura (13.0) or later.
How to Disable Lockdown Mode
Follow the same path: Settings, Privacy & Security, Lockdown Mode, then tap Turn Off Lockdown Mode. Your device restarts and returns to normal operation. If your iPhone battery drains fast, our guide covers 15 fixes that apply whether or not Lockdown Mode is active. You can also exclude specific websites from Lockdown Mode restrictions in Safari if you need certain sites to function normally while keeping protections active everywhere else.
The FBI Case That Proved Lockdown Mode Works
In a 2025 federal investigation, FBI forensic analysts attempted to extract data from an iPhone with Lockdown Mode enabled. The bureau’s standard tools, including Cellebrite UFED and GrayKey (now Magnet GrayKey), could not bypass the device’s protections. The USB restriction in Lockdown Mode prevented the forensic tools from establishing a data connection to the locked device.
This case followed Apple’s $10 million Cyber Security Research Fund specifically aimed at improving defenses against state-sponsored spyware. Apple has also filed a lawsuit against NSO Group, the Israeli company behind Pegasus spyware, which has been used to target journalists, human rights advocates, and political figures in over 45 countries according to research by Citizen Lab at the University of Toronto.
Pegasus exploits zero-click vulnerabilities, meaning it can compromise an iPhone without the owner tapping any link or opening any file. Lockdown Mode’s approach of disabling entire feature categories (rather than patching individual bugs) makes it effective against zero-day exploits that Apple has not yet discovered.
Who Actually Needs iPhone Lockdown Mode
Apple explicitly states that Lockdown Mode is designed for “the very few users who, because of who they are or what they do, might be personally targeted by some of the most sophisticated digital threats.” This includes journalists investigating government corruption, political dissidents and human rights activists, diplomats and government officials, executives handling sensitive corporate data, lawyers working on high-profile cases, and domestic abuse survivors whose partners have surveillance capabilities.
If you do not fall into these categories, standard iOS security protections are sufficient. Apple’s default encryption, Secure Enclave hardware, and regular security updates already provide strong protection against common threats. Lockdown Mode addresses a specific threat level that the vast majority of users will never encounter.
That said, enabling Lockdown Mode costs nothing and can be reversed instantly. If you travel to high-risk countries, attend sensitive meetings, or simply want the strongest possible security during specific periods, toggling it on temporarily is a reasonable precaution.
Performance Impact and What You Lose with Lockdown Mode
The most noticeable daily impact is web browsing speed. With JIT compilation disabled, JavaScript-heavy sites load 10-30% slower depending on complexity. Some web applications, particularly those using WebAssembly or complex animations, may not function correctly. You can add specific trusted websites to an exclusion list to restore normal browsing on sites you use regularly.
iMessage becomes text-and-images only. You lose link previews, file attachments (PDFs, documents, audio), and some message effects. FaceTime calls only work from contacts you have previously called, which means unexpected calls from new numbers are silently blocked. Shared Albums in Photos are disabled entirely.
Battery life is not significantly affected. Some users report marginally better battery performance because background processes like link preview generation and JIT compilation are eliminated. GPS, cellular, Bluetooth, and all standard phone functions continue working normally.
Lockdown Mode vs Standard iPhone Security Settings
Even without Lockdown Mode, your iPhone includes robust security: hardware-level encryption via the Secure Enclave chip, biometric authentication through Face ID or Touch ID, app sandboxing that isolates each application, and automatic security updates. These protections stop the overwhelming majority of attacks.
Lockdown Mode adds a layer specifically targeting sophisticated, well-funded attackers who exploit zero-day vulnerabilities. Think of it as the difference between locking your front door (standard iOS security) and installing a bank vault door (Lockdown Mode). Both protect against theft, but the vault door is designed for threats that a regular lock cannot handle.
For users who want enhanced security without the trade-offs of full Lockdown Mode, Apple also offers Advanced Data Protection for iCloud, which enables end-to-end encryption for almost all iCloud data categories including backups, photos, and notes. This can be enabled independently of Lockdown Mode through Settings, your Apple ID, iCloud, then Advanced Data Protection.
Frequently Asked Questions
Does Lockdown Mode slow down my iPhone significantly?
Web browsing is 10-30% slower on JavaScript-heavy sites because JIT compilation is disabled in Safari. Phone calls, messaging, camera, Apple Pay, and most apps perform identically to normal mode. You can exclude specific websites from Lockdown Mode restrictions if certain sites you rely on break or load too slowly.
Can I still use iMessage and FaceTime with Lockdown Mode on?
Yes, with limitations. iMessage works for text and images but blocks other attachment types and link previews. FaceTime only accepts calls from people you have previously called or FaceTimed. New contacts trying to FaceTime you for the first time will be silently blocked until you initiate a call to them first.
Does Lockdown Mode protect against all spyware and hackers?
Lockdown Mode significantly reduces the attack surface that sophisticated spyware like Pegasus exploits, but no security measure provides absolute protection. It blocks the most common exploit vectors (JavaScript JIT, USB data transfer, message attachments) used in state-sponsored attacks. Combined with regular iOS updates, it represents the strongest commercially available mobile security.
Can I turn Lockdown Mode on and off as needed?
Yes. Lockdown Mode can be toggled on or off at any time through Settings, Privacy and Security, Lockdown Mode. Each toggle requires a device restart that takes about 30-60 seconds. Some users enable it only when traveling internationally or during periods of elevated risk, then disable it when they return to normal conditions.
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