Hi as per my provider ,my handset is required software upgrade for 5g uses.

abhaya003 Said:

"Hi as per my service provider Airtel ,my handset iphone 12 is required software upgrade for 5g uses."

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Updating an iPhone:

So, what's the upgrade it is prompting your for?

A. Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

B. Update the iOS Using a Computer:

• Use my User Tip:  Update your iPhone Using a Computer - User Tip
• IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

abhaya003 Said:

"Hi as per my service provider Airtel ,my handset iphone 12 is required software upgrade for 5g uses.: Hi No such manual option for carrier update ,only can select network which I have selected manually”

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Seems to me you need up update your iOS. So, what happens when you try? Or is it not successfully updating?

How to Update your iPhone Not Via WiFI:

A. Cellular:

See my User Tip: Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip

B. Ethernet on a Computer:

You can update on a computer though use Ethernet. You might want to be a bit careful about using Cellular, as lots of data would be consumed --so be cautious of that, if you don't have unlimited data.  Learn More here: Back up iPhone - Apple Support

Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update.

Carriers in India do not yet support 5G on the iPhone. It is up to THEM to issue an update to support it, not Apple.