5G not showing on iPhone after SIM card insertion

E, 2G, 3G, 4G, LTE, VoLTE, and 5G all are Carrier Specific features. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM / eSIM to you. About the LTE options on your iPhone - Apple Support (IN)

See the Pic below and the explanations thereof

The pic below is self-explanatory

However, iPhone model-specific feature is listed here --> Identify your iPhone model - Apple Support . and tap on "See the Technical Specs for Model "XXXXXX" under each model and Scroll down to the "Cellular and Wireless" section.

Hello! Good morning!

It seems like your iPhone doesn’t support the SIM card in your region.

Or else you should wait or restart your iPhone

Lastly contact your carrier for more info and check if you phone is an unlocked phone

Thanks