How to Turn On Developer Mode on iPhone 16

Developer Mode lets you test apps before they reach the App Store

Developer Mode on iPhone 16 is a setting that unlocks tools for people building and testing software. When you turn it on, your phone stops blocking unsigned apps — software that hasn't been verified by Apple — so you can run code you're writing or testing without going through the full App Store process. This is essential if you're learning to code, testing an app you built, or working with beta versions of software.

Apple added Developer Mode as a security feature starting with iOS 16. The setting exists because unsigned apps can pose risks if installed carelessly, so Apple requires you to explicitly enable the mode rather than leaving it on by default. Once enabled, you'll see warnings when you try to run unsigned code, but the phone will let you proceed.

Key Takeaways

Developer Mode is found in Settings under Privacy & Security, and you must have iOS 17.4 or later on your iPhone 16 to access it.
Turning on Developer Mode requires you to restart your phone and then confirm the setting a second time before it fully activates.
Once enabled, you can run unsigned apps and use Xcode (Apple's development tool) to test software directly on your device.
Developer Mode only affects your personal phone and does not change how other people can install apps from the App Store.

Step-by-step: Enabling Developer Mode on iPhone 16

Open the Settings app and tap Privacy & Security. Scroll down to the bottom of the screen — you'll see a section labeled Developer Mode with a toggle switch next to it. Tap the toggle to turn it on. Your phone will show a warning explaining that Developer Mode allows unsigned code to run. Read the warning and tap Allow to confirm.

Your iPhone will ask you to restart. Tap Restart and wait for your phone to power down and turn back on. This usually takes about 30 seconds. After the restart completes, go back to Settings > Privacy & Security and scroll to Developer Mode again. You'll see the toggle is now on, but iOS will ask you to confirm one more time. Tap the toggle again and select Allow. This second confirmation is intentional — Apple wants to make sure you're not turning it on by accident.

Once you see the Developer Mode toggle is on and stays on after you close Settings, the feature is fully active. Your phone is now ready to run unsigned apps and connect to development tools like Xcode.

What you need before turning on Developer Mode

You need an Apple Developer Account to do most things with Developer Mode. This account is free to create at developer.apple.com, though some advanced features require a paid membership ($99 per year). The free account lets you test apps on your own device, which is what most people starting out need.

You also need Xcode, which is Apple's tool for writing and testing iPhone apps. Xcode is free and installs from the Mac App Store — you'll need a Mac computer to use it. If you're on Windows or Linux, you cannot use Xcode, and you'll need to explore other development paths like React Native or Flutter, which work across platforms but have a steeper learning curve.

Finally, connect your iPhone 16 to your Mac with a USB-C cable. Xcode uses this connection to send your code to your phone and run it. Make sure both devices are on the same Wi-Fi network, or use the cable for a direct connection.

Connecting your iPhone to Xcode after enabling Developer Mode

Open Xcode on your Mac and plug in your iPhone 16 with a USB-C cable. Your phone will show a prompt asking whether you trust this computer. Tap Trust and enter your iPhone passcode. Xcode will recognize your phone and show it in the list of available devices at the top of the window.

If your phone doesn't appear in Xcode after a few seconds, unplug the cable, wait 10 seconds, and plug it back in. Sometimes the connection takes a moment to register. If it still doesn't show up, restart both your Mac and your iPhone, then try again. Once your phone appears in Xcode's device list, you can select it and run your app directly on the device instead of using the simulator.

Why Developer Mode requires a restart

The restart is a security checkpoint. When you enable Developer Mode, iOS changes how it handles code signing — the system that verifies whether software is safe to run. This change affects the core of how your phone operates, so iOS requires a restart to explore it safely. The second confirmation after the restart is another security layer: it ensures the setting actually took effect and that you meant to enable it.

This two-step process (toggle, restart, toggle again) might feel like extra work, but it prevents accidental set up. If someone briefly turned on Developer Mode without your knowledge, the restart would interrupt them, and they'd have to confirm again when your phone came back on.

What changes when Developer Mode is on

Your phone will run unsigned apps, which means code that hasn't been reviewed by Apple. You'll also see additional warnings when you try to launch these apps — iOS will remind you that the software hasn't been verified. These warnings are normal and expected; they're not errors, just confirmations that you're running something outside the App Store.

Developer Mode does not change how the App Store works or how other people can install apps on your phone. If someone borrows your iPhone, they can still read apps normally from the App Store. Developer Mode only affects your ability to run code you're testing yourself. It also doesn't weaken your phone's security for everyday use — it straightforward removes one specific block that Apple puts in place for non-developers.

Turning off Developer Mode if you no longer need it

Go to Settings > Privacy & Security and scroll to Developer Mode. Tap the toggle to turn it off. Your phone will ask you to confirm and will restart again. After the restart, Developer Mode is disabled, and your phone returns to its standard state. You can turn it back on anytime using the same steps.

If you're selling your iPhone or giving it to someone else, turn off Developer Mode before handing it over. This resets your phone to Apple's default security settings and removes any connection to your development tools.

Frequently Asked Questions

Do I need Developer Mode just to use apps from the App Store?

No. Developer Mode is only for people building and testing their own software. Everyone else can read and use apps normally without ever enabling it. The App Store works the same whether Developer Mode is on or off.

Will turning on Developer Mode slow down my iPhone?

No. Developer Mode doesn't affect your phone's speed or battery life. It straightforward removes a restriction on unsigned code. Your everyday apps and performance remain unchanged.

Can I use Developer Mode without a Mac?

You can turn on Developer Mode on your iPhone, but you'll need a Mac running Xcode to actually send code to your phone and test it. If you don't have a Mac, you can still learn to code using online tools and simulators, but testing on a real device requires Xcode.

What happens if I restart my phone while Developer Mode is on?

Developer Mode stays on. Restarting your phone doesn't turn it off. You have to manually disable it in Settings if you want to turn it off.

Is it safe to have Developer Mode enabled all the time?

Yes, it's safe. Developer Mode doesn't create a security hole for normal use. The only risk is if you run unsigned code from an untrusted source, which you control. If you're not actively testing apps, you can turn it off to match Apple's default settings, but leaving it on won't harm your phone.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.