What to do if I can’t see where it says Software Update meaning the option is not there only about on the iPhone 7

Characha wrote:

It still hasn’t help it’s a 14.8 version IPhone 7+ though

Check for a management profile, and check for a beta. I’d suspect this iPhone is managed, and updates are locked.

In iOS 15 (don’t have 14 handy to check) that’s at Settings > General > VPN& Device Management

How to uninstall iOS or iPadOS beta software - Apple Support

And if this device is supervised, yes, you’ll need to contact the organization that is supervising it. Management profiles can be removed, but a device that is supervised can only be cleared by the organization that has supervised it. A device that is supervised will have a notice posted at the top of the settings page, located at the top of the column above your name and the Apple ID settings.

iPhone 7 tops out at iOS 15.

If you don’t have the software update button, restart the iPhone, and check again. Then shut off Screen Time / Focus / Parental Controls, and confirm that the device is not managed; that no profiles are loaded, and check again.

Do you have a MDM profile?

If so, contact your company - IT department.