Software update

I did see it. I hope you saw my reply. I will repeat what I said, with emphasis added:

To update go to Settings/General and you should see Software Update. It may be missing if your phone has a corporate or school email account on it, was issued by a business or is under Mobile Device Management (MDM). If that is the case contact your IT administrator.

I’m not sure what you mean by “button”.

To update go to Settings/General and you should see Software Update. It may be missing if your phone has a corporate or school email account on it, was issued by a business or is under Mobile Device Management (MDM). If that is the case contact your IT administrator.

Contact Customer Support by phone or chat:

• Call Apple Support at 1-800-APLCARE. 📞
• International Support. 🌐
• Contact Apple Support. 📝
• Chat using Messages. 💬

Perhaps you need to plug it in and/or connect to a Wi-Fi network to activate the button.