If you have upgraded your iPhone 12 Pro to iOS 15 and still can not use wide spectrum mode, you will get a message on the top of your screen that says Wide Spectrum is now unavailable. When you try to choose it on your iPhone 12 Pro, you appear to get a warning that says "Wide Spectrum is currently unavailable." Just Switch off your iPhone. Although restarting may appear to be a simple process, it can occasionally assist in the resolution of problems.