My phone software update

Hello AroraYASH2,

Thank you for reaching out in Apple Support Communities. If we're understanding correctly, you're unable to update the software on your iPhone. We can help point you in the right direction.

From the screenshot you provided, the iPhone is connected to cellular data. In order to update the software on your iPhone, you'll need to be connected to a Wi-Fi network. Here's an article with the proper steps: Update your iPhone, iPad, or iPod touch

If you encounter an issue with the update, please follow the steps outlined here: If your iPhone, iPad or iPod touch won’t update

Best regards.