How can our iPhone7 version update and iOS

-Alio wrote:

How can update new iOS version

Apple smartphones from 2017's iPhone 8 or newer can install iOS 16.

your iPhone 7

Update your iDevice - The current stable release of iOS including bug fixes, is iOS 15.6.1

Update your iPhone, iPad, or iPod touch - Apple Support

You may update to iOS 15.6.1. You have not mentioned what iOS version your device is on.