To switch off restrictions on your iPhone, you'll need to go to the Settings app, then tap on Screen Time, and select Content & Privacy Restrictions. From there, you'll see a toggle switch at the top of the screen, just toggle that off to disable the restrictions. If you have a passcode set up for Screen Time, you'll be prompted to enter it before you can make any changes. Once you've toggled off the restrictions, you should be able to access all the features and apps on your iPhone without any limitations.