Yesterday, Apple released iOS 14.5 along with iPadOS 14.5 and watchOS 7.4 to its users worldwide. One more under the radar feature with the new update for iPhone 12 series users is the ability to have 5G connectivity in Dual SIM mode.
Dual SIM 5G confirmation from Apple
Before the update, you would be limited to 4G LTE when using two SIM cards at the same time, whether or not they were 5G ready. Now you can only have one line of 5G connectivity and it will only be used for data according to the official change log released by Apple.
Smart Data Mode can now switch to 4G LTE connectivity when you are not using your iPhone to help extend battery life.
Check out all the new iOS 14.5 add-ons here.