Many people encounter a problem that's their iPhone is frozen and they don't know how to fix. many reasons can cause the iPhone frozen, The following four points are the main reason:
Reason 1: Low Available Space
Just because you have 16GB, 32GB or 64GB of storage on your iPhone doesn't mean you should try to stuff apps and multimedia onto every last megabyte. When your iPhone's storage capacity is full, your device has a harder time functioning and becomes more likely to suffer slowdowns or freezes. If your iPhone has little or no free space, removing some multimedia content might improve its performance and stability.
Reason 2: Uninstalled Updates
Apple releases updates to the iPhone's iOS operating system specifically to keep ahead of performance issues in its operating system. If your iPhone is freezing, the source could be a software issue that an update from Apple has already fixed. Check for uninstalled software updates in your iPhone's settings to make sure you're not missing any system or stability fixes.
Reason 3: Buggy Apps
Apps don't go straight from the developer's computer onto the App Store. Apple first reviews every app for serious programming defects and compliance with its developer guidelines, but the review process cannot catch every bug that might be hiding in the source code. If your iPhone tends to freeze while you are using a particular app, then that app is likely the problem. You can check to see if there is an updated version of the app or delete the app and download it again, but if the problem persists you should stop using that app.
Reason 4: Low Battery
If your iPhone is frozen on a blank screen, the problem could be that you need to recharge your battery. According to Apple, when your iPhone's battery level is low, your device's screen could stay blank for up to 10 minutes before displaying the low battery image. If the battery is completely drained, it could take up to 20 minutes of charging before your device begins working normally again. When your iPhone notifies you the battery is down to 10 percent of capacity, you should recharge it at the first opportunity.
How to fix a frozen iPhone?
When this happens, you can try to reboot your iPhone in the first place. And then force your iPhone to restart if it doesn't work. If all of these won't fix the iPhone back to normal, let's take the last chance to restore your device. However, you will be at risk of losing data after iTunes restore. If you want to fix frozen iPhone but keep your data safe, We highly suggest that you can use an iOS system repair software, FoneLab iOS System Recovery which is able to fix all above described iPhone screen frozen problems. Let's give it a try and follow these steps:
Step 1: Download and install FoneLab to your Windows or Mac OS computer.
Step 2: Plug your iPhone into the computer after the installation is finished. Choose More tools and iOS System Recovery after the software recognizes the device.

Step 3: The software can detect the connected iPhone is in abnormal state like: Stuck at Apple logo, Recovery mode, DFU mode, Black screen, etc. and it will ask you to click the Start button to get started.

Step 4: You will be asked you to confirm the information of your iPhone. Click Repair if it is correct, but if not, select the exact information manually before repair. To fix your iOS, the program will download the latest version of your firmware after detecting your current iOS version.
With the help of FoneLab iOS System Recovery, you can kick out of all kinds of frozen screen on iOS device with just a few clicks. Most importantly, you will absolutely not lose or change anything on your device during the repair process.
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