How to turn on Lockdown Mode on iPhone – so even the FBI …

Lockdown Mode defends your iPhone against cyber attacks and can block forensic tools after an FBI seizure. Here’s how it works.

ZDNET's recommendations are based on many hours of testing, research, and comparison shopping. We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing. When you click through from our site to a retailer and buy a product or service, we may earn affiliate commissions.

This helps support our work, but does not affect what we cover or how, and it does not affect the price you pay. Neither ZDNET nor the author are compensated for these independent reviews. Indeed, we follow strict guidelines that ensure our editorial content is never influenced by advertisers. ZDNET's editorial team writes on behalf of you, our reader. Our goal is to deliver the most accurate information and the most knowledgeable advice possible in order to help you make smarter buying decisions on tech gear and a wide array of products and services.

Our editors thoroughly review and fact-check every article to ensure that our content meets the highest standards. If we have made an error or published misleading information, we will correct or clarify the article. If you see inaccuracies in our content, please report the mistake via this form. The iPhone has a little-known and extreme security feature called Lockdown Mode. Most people will never need it, but it's in the news this month after the FBI reportedly seized a journalist's phone and couldn't access it because Lockdown Mode was enabled.

Introduced with iOS 16 about four years ago, Lockdown Mode is available to anyone, but it is really meant for people facing serious, targeted threats, such as reporters, politicians, and activists. It does exactly what the name suggests: it locks down your iPhone by aggressively shutting off features and reducing the ways attackers, or even law enforcement, can try to access it. When enabled, Lockdown Mode blocks most message attachments and link previews, restricts advanced web technologies, limits incoming FaceTime calls, and disables features like SharePlay, Game Center, and certain Apple service invitations.

It also removes shared photo albums, strips location data from shared images, requires devices to be unlocked before connecting to accessories or computers, blocks nonsecure Wi-Fi networks, and prevents device management profiles from being installed. That is a lot. The tradeoff is a much more limited, less convenient iPhone, but one that is significantly harder to attack. Apart from the FBI situation, I was recently reminded of Lockdown Mode after reading ZDNET's guide on how to lock down your phone before heading to a protest.

It's not mentioned there, likely because it is so intense, but it is still an option worth knowing about. Whether you are heading out to exercise your constitutional rights or in a high-profile role where security truly matters, Lockdown Mode is worth turning on at least once to understand how it works and enable it quickly if needed. What you'll need: Before turning on Lockdown Mode, update your device to the latest version of iOS and back it up.

If something goes wrong and you later need to erase or restore your device, a recent backup helps prevent data loss. Lockdown Mode is reversible, but because it is designed for high-risk situations, a backup is simply a safety net. You can search for it by swiping down from the middle of the Home screen to open Spotlight Search or by tapping the Search button at the bottom of the screen. You can also search for it directly within the Settings app.

On the Lockdown Mode screen, Apple suggests you enable it if you believe you're being targeted in a cyberattack. It explains that apps, websites, and some feature functionality will be limited, that certain experiences may be completely unavailable, and then directs you to a support page to learn more. Ready to try Lockdown Mode? Then tap the "Turn On…" button on the Lockdown Mode screen. Apple will immediately show you a warning list of what will stop working or be restricted once the feature is enabled.

Once you've read that and are OK to proceed, scroll to the bottom and tap "Turn on Lockdown Mode." At this point, you will be prompted to restart your iPhone. A dialog box will appear with two options: Turn On and Restart or Cancel. Tap the former. You will then need to authenticate your device. After your iPhone restarts, Lockdown Mode should be active. Safari will display a banner confirming it, and some apps may notify you that certain features are now limited.

Phone calls, including SOS emergency calls, and plain text messages will continue to work, although Apple said incoming calls will not ring on a paired Apple Watch. In fact, if you own another Apple device, such as a Mac, you will be prompted on that device to enable Lockdown Mode as well for full protection. Just tap the "Turn on" button when the dialog box appears. Let's say there is a trusted website or app you absolutely need to use while Lockdown Mode is enabled, for whatever reason.

The feature does allow limited exceptions, mainly for Safari and apps with limited functionality. To exclude websites, open Safari, load the site, tap the page menu, and turn off Lockdown Mode. From that menu, you can also exclude your limited-functionality apps, but only if you've opened them since enabling Lockdown Mode. Apple strongly advises against excluding them, since every exception reduces protection.

If you are wondering whether the FBI or an attacker can simply turn off Lockdown Mode, the answer is no, not easily. Disabling it requires physical access to the iPhone and the device passcode or biometric authentication. Lockdown Mode is designed to protect against remote, targeted cyberattacks such as spyware, and it also blocks many forensic techniques, including those that rely on wired connections to a locked device.

If someone already has full access to your unlocked phone, most security features are at risk anyway. Lockdown Mode's value is making both remote compromise and locked-device data extraction far more difficult. Court records reportedly show that agents were unable to extract data from a Washington Post journalist's seized iPhone because Lockdown Mode was enabled. Although they had the phone in their possession and it was powered on and charging, with Lockdown Mode enabled, the FBI's forensic tools could not access its contents.

It takes a few quick taps to enable Lockdown Mode. The fastest way is to quickly search for "Lockdown Mode" using Spotlight or the Settings search bar. Once it opens, tap Turn On, swipe past the warning, and tap Turn On again. You'll need to authenticate, and your iPhone will then restart, which can take about a minute. Lockdown Mode is active after that. Not really. Core features like calls and texts still work, but many services and features are limited, from blocked message attachments to restricted FaceTime calls.

Apple says Lockdown Mode is for people who face a real risk of targeted cyberattacks. Most users do not fall into that category. It can also be useful for anyone concerned about law enforcement seizing their phone, including journalists and protesters. Not really. For most people, the standard security features built into iOS are more than enough to thwart attackers. Yes. Authentication is required to turn on/off Lockdown Mode, and you'll need to enter your passcode again after the iPhone restarts.

Summary

This report covers the latest developments in iphone. The information presented highlights key changes and updates that are relevant to those following this topic.

---