If the screen of your iPhone is switching ON as soon as it is picked up or carried around, you can find below the steps to Stop iPhone from Waking up when it is picked up.
Stop iPhone From Waking When it is Picked Up
When the Raise to Wake feature is enabled on iPhone, it allows your device to automatically switch ON the screen, whenever it is being picked up.
While this feature is liked by some users, there are others who want to Stop iPhone from Switching ON when it is picked up, in order to prevent the possibility of Lock Screen Notifications being viewed by others around them.
Steps to Stop iPhone from Switching ON When Picked Up
All that is required to prevent iPhone from waking up when it is picked up is to disable Raise to Wake feature on your device.
Go to Settings > Display & Brightness > move the toggle next to Raise to Wake to OFF position.
Once, the Raise to Wake feature is switched off on your device, you will no longer find your device automatically waking up when it is picked up or carried around.