Please update my phone

You have an iPhone 7 and it can be only updated to iOS version 15.7 at this time. Nothing further. If you already have iOS 15.7 on your iPhone 7 then your iPhone is up to date. If there is a lower version of iOS on your iPhone 7 and you are having difficulty updating it, then read below:

Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version over a Wi-Fi Network. Open Settings ➡️ General ➡️ Software Update: If there is an update available for your iPhone then it will be listed here. Follow the on-screen instructions to download and update your iPhone. 

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• The iPhone can not be in Low Power mode
• The battery state of charge must be above 50%
• Your iPhone must have at least 6GB or more free storage space
• Your iPhone cannot be connected through VPN
• You should leave the phone plugged in until it finishes updating, both to assure that it remains above 50% and to keep Wi-Fi enabled (Wi-Fi turns off when the phone sleeps if not connected to power).

Axel F.

Possibly because it is not compatible with iOS 16?

The highest possible for the iPhone 7 is iOS 15.7.

If this is not the issue, post back with relevant details.