If it is an iPhone SE 1st gen, 6S, 6S Plus, 7 or 7Plus you can update to iOS 15.7.8, you can check by reading this Apple article: iPhone models compatible with iOS 12 -> iOS 16. iPhone models compatible with iOS 15.5 – Apple Support (UK) You need about 8 GB device storage and good Service and/or Wi-Fi. If they are On, turn Off Hotspot & VPN.
How many years will the iPhone 7 be supported? But it still receives iOS 15 security updates (as of31.October 2022).The last version of iOS that iPhone 7 supports is iOS 15.7. 3 In June 2022, Apple announced that they would be dropping support for the iPhone 7 and 7 Plus with the release of iOS 16.

Go to Settings/General/About and note the iPhone Model Name, then check its version compatibility from this list: iPhone 8 or newer, including SE 2nd and 3rd editions, you can update to 16.5.1. Any iPhone series 6S and 7, and original SE: You can update to 15.7.7. iPhone 5S or 6: You cannot update to iOS 13 or higher; you can update only to iOS

The iOS versioning system follows a sequential order, which means that iOS 16 will be released after iOS 15.7. However, upgrading from iOS 15.7 to iOS 16 is not a direct process. Each iOS version brings its own features, bug fixes, and security updates, so it is important to keep your device up to date.

Apple has released iOS 15.7.5 update for devices that are not compatible with iOS 16 or later. The update is now available for download. iOS 15.7.5 comes 13 days after Apple released iOS 15.7.4. If you have an iPhone 7 or older, then you can download iOS 15.7.5 over the air by heading to the Software Update section of your device. On your iPad or iPod touch, go to Settings > FaceTime, then turn on Calls from iPhone. On your Mac, open the FaceTime app, then choose FaceTime > Preferences. Click Settings, then select Calls From iPhone." If you are using the same Apple ID, it would be recommended that each family member has their own Apple ID.
The 8 is the oldest iPhone able to update to iOS 16, so next year, it will probably drop off. My guess is updating to iOS 16 will exacerbate your performance problems, & probably tax your battery further. If you absolutely don't want to upgrade your phone, you might try a new battery, to see if that would help, but the inconsistent performance
What you get is Settings > General > Software update > [All options are available here] If iOS updates are no longer being released for your device, it typically means that the device has reached its end of life in terms of software support from Apple. In such cases, there are a few options you can consider: These are the iOS options based on iPhone Model --> You need to Identify your iPhone model - Apple Support iOS 15.7 —> 6S / 6S Plus, SE (1st Gen), 7 / 7 Plus, iOS 15.7 or iOS 16 --> SE (2nd and 3rd Gen), 8 / 8 Plus, X, XR, XS /XS Max, 11,11 Pro /11 Pro Max, iPhone 12, 12 Mini, 12 Pro, 12 Pro max, iPhone 13, 13 Mini, 13 Pro, 13 Pro Max, 14, 14 JZrsbEh.
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    • does iphone 7 support ios 15.7