Go to Settings > Cellular > Cellular Data Options . If you see this screen, your device has 5G activated. If you don’t see this screen, contact your carrier to confirm that your plan supports 5G. Turn on Airplane Mode, then turn it off.
Read moreHow do I turn on 4G on my iPhone 12 mini?
How to switch between 5G and 4G LTE on your iPhone 12
Read moreHow do I turn off my 5G on my iPhone Mini?
Open the Settings app then go to Cellular > Cellular Data Options > Voice & Data and tap LTE . Your phone will then turn off its 5G connection, reverting to (sometimes) slower LTE connection.30 Eki 2021
Read more