Want to upgrade my iPhone 7

Hello, if you speaking about software upgrade go to settings>general>updates then you can update to the 15.7. If you’re talking about upgrading your iPhone then you can do so by recycle or trading in you’re a on the apple website for a new iPhone. Hope this helps!

To update your iPhone, select Settings > General > Software Update. The iPhone 7 should be able to update to 15.7