iPhone x I want update to iOS 16

Go to Settings/General/Software Update and follow the instructions.

To update over the air from the phone all of these requirements must be met:

• You need at least 6 GB of free storage
• You must be connected to a Wi-Fi network (and not a personal hotspot)
• The phone must be charged to at least 50%, and preferably plugged in so it stays above 50% during the update
• The phone must not be in Low Power Mode
• The phone must not be connected through VPN, and it may be necessary to delete any VPN apps and VPN profiles
• The phone cannot be in Airplane mode
• You cannot still have a beta version installed on the phone
• You cannot have a previous version that was downloaded, but not installed - go to Settings/General/iPhone Storage to look; if you find an iOS installer, delete it

If you can't meet all of them you can still update using your computer.

i have done this method and installed IOS 16 on my iPhone X ,the phone is not working proper not scrolling ,touch is not working smooth too much lagging ,,, APPLE should have to solve this problems on iPhone x , the support team is also not cooperating , they do diagnostic method to my phone and asked me to change my phone battery i have changed but the issue is same , too much tired from this version , this was my big mistake to update the IOS 16

Check to see if it is available on your iPhone.

Settings > General > Software Update

What do you see here?