Will iPhone automatically switch to 5G?

Go to Settings > Mobile > Mobile Data Options . If you see this screen, your device has 5G activated. If you can’t see this screen, contact your network provider to confirm that your plan supports 5G.

Switch between 2G/3G/4G/5G – Samsung Android

These include higher-quality FaceTime, high-definition content on Apple TV, Apple Music songs and videos, iOS updates over cellular, and automatic iCloud backups. With this setting, your iPhone can automatically use 5G instead of Wi-Fi when Wi-Fi connectivity is slow or insecure on a network you visit occasionally .17 Mar 2022

Changing your SIM card will help to ensure you get more 5G in more places when using a compatible device , such as indoors and in rural locations, and will make sure you’re ready to take advantage of future network enhancement.