If your iPhone 17 screen is completely frozen, the fastest thing to try is a force restart. Press and quickly release the Volume Up button, then quickly press and release the Volume Down button. Immediately after, press and hold the Side button. Keep holding it until you see the Apple logo appear, then let go. This can clear a temporary software glitch that's locking up the touchscreen.
I'd start with this one, as it works for most unresponsive screen issues without affecting your data. It's the digital equivalent of pulling the plug and plugging it back in for your phone's main processor.
Clean the Screen and Your Hands
It sounds simple, but moisture, lotion, or grease on the screen can seriously interfere with the capacitive touch sensors. Use a soft, lint-free cloth to thoroughly wipe the screen clean. Make sure your fingers are completely dry, too.
If you've recently applied a new screen protector, check for any bubbles or lifting edges. A poorly applied protector, especially a thick glass one, can sometimes cause dead zones. Try gently pressing down on the edges to ensure it's fully adhered.
Check for a Software Update
A bug in iOS 26 could be the culprit. Go to Settings > General > Software Update. If an update is available, install it. It's best to do this while connected to Wi-Fi and a power source.
Software updates often include patches for touchscreen driver issues. If your screen is partially working, you might be able to navigate using a connected Bluetooth mouse under Settings > Accessibility > Touch > AssistiveTouch to initiate the update.
Test Touch Response in Diagnostics
Your iPhone 17 has a built-in diagnostic tool that can test the touchscreen hardware. You can access it through the Phone app by dialing a specific code, but the exact code varies. A more reliable method is to contact Apple Support through the Apple Support app and ask them to run a remote diagnostic.
This test will have you touch and drag your finger across the entire screen. It can confirm if the issue is a hardware fault with the digitizer or a software problem. If large sections fail to register in the diagnostic, it points to a physical repair.
Close All Apps and Free Up RAM
Sometimes, a single misbehaving app can hog system resources and freeze the interface. If you can, swipe up from the bottom of the screen and hold to enter the app switcher. Swipe up on all app previews to close them.
For a more thorough refresh, you can trigger a RAM clear. Quickly press and release the Volume Up button, then the Volume Down button, then press and hold the Side button. Don't let go when you see the power off slider. Keep holding until you see the Apple logo.
Check Accessibility and Guided Access Settings
Accidentally enabled settings can lock the screen. Go to Settings > Accessibility. Look at features like Touch > AssistiveTouch or Voice Control to see if they're on and potentially interfering.
Also, check if Guided Access is active. Quickly press the Side button three times. If it is, you'll be prompted for a passcode. Enter it to turn Guided Access off. This mode locks the phone to a single app and can disable certain parts of the screen.
Reset All Settings
This won't erase your photos, messages, or apps, but it will reset all your preferences. Go to Settings > General > Transfer or Reset iPhone > Reset. Then, choose Reset All Settings.
You'll need to re-enter Wi-Fi passwords and reconfigure things like wallpaper and notifications. This fixes problems caused by a corrupted system setting file that might be affecting the touchscreen driver.
Restore Your iPhone via Computer
This is the most comprehensive software fix. Connect your iPhone 17 to a Mac or PC with a USB-C cable. On a Mac with macOS or a PC with iTunes, put the phone into Recovery Mode. First, do the force restart steps, but keep holding the Side button even after the Apple logo appears until you see the recovery mode screen.
On the computer, choose to "Restore" your iPhone. This will install a clean, fresh copy of iOS 26. You can then restore your data from a recent iCloud or computer backup. This eliminates any deep-seated software corruption.
