If your iPhone device has been stuck with the white screen and no longer responds to orders, you are not the only one. This problem has become very common and is facing both iPhone 7, iPhone 8, as well as newer devices in the iPhone 16 series.
This problem seems to most affect the iPhone 13 and iPhone 13 Pro devices. Many of these iPhone devices have remained blocked and display a white screen.

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Why did the iPhone have stuck with the white screen?
Blocking the iPhone or iPad screen on a bright white background, without the possibility of interacting with the device, is a frustrating, but quite common problem. The causes of this problem can be divided into two main categories: software errors and hardware failures.
Software errors at iOS update
Most users who say the iPhone has been stuck with the white screen after updating the iOS operating system. Sometimes, updating the operating system can fail, leaving the device locked on the white screen. This may occur due to an unstable internet connection, lack of space on the device or interruption during the installation process.
In some cases, the installation of an application that is not completely compatible with the current iOS version can generate errors and lead to the screen blocking. This would be the happiest cause from which the iPhone screen remains blocked and displays the white color.
Also, devices that have undergone a jailbreak process are more vulnerable to such problems. The white screen can occur after the faulty installation of a jailbreak version or due to the incompatibility between the installed software and the iOS version of the device.
Hardware faults
Unfortunately, hardware faults are the most common causes from which iPhone has been stuck and displays the white screen, without the user being able to do something.
The problem may arise from physical shocks if the iPhone has been escaped on a hard surface and the internal components have been affected. For example, the connecting wire between the motherboard and screen can be weakened or broken, which leads to blocking the screen on white.
The cause can also be a problem that directly affects the iPhone screen. Problems with display or display controller can also cause blockages. These are often the result of wear or manufacturing defects.
How can the problem be solved if the iPhone has been stuck with the white screen.
Before appealing to an Apple Authorized Service, try the classic forced reboot of the device. In many situations this is the simplest solution if iPhone has been stuck and displays the white screen due to a software problem.
The combination of buttons you have to press for forced restart varies depending on your iPhone model.
For iPhone 8 and newer models, press quickly and release the volume increase button, then the volume drop button. Finally, hold the side button until the Apple logo appears.

For iPhone 7 and iPhone 7 Plus devices, hold simultaneously the side button and the volume drop button until you see the Apple logo. This method is different because the home button is no longer mechanical.

If you have one older iPhone model, holds the Home button simultaneously and the start button until you see the Apple logo. When the Apple logo appears on the screen, release both buttons. This method works for older models, such as iPhone 6, 6 Plus, 5S or iPhone SE (first generation).
Related: Why do spots or green lines appear on the iPhone screen?
If the above method does not work and the iPhone screen remains white, it is most likely a hardware problem. You need to find the closest Apple authorized service From your area where to take the device for diagnosis and repair.
Thank you, you were very helpful. I managed to get out of the screen lock at an iPhone 7plus