How to get official iOS 16 version?

Go to Settings->General->VPN and Device Management and make sure you have removed the beta Profile from there completely.

Then restart the iPhone, connect to Wi-Fi, and try again.

Link-> Update your iPhone or iPad - Apple Support

Link-> How to uninstall iOS or iPadOS beta software - Apple Support

Possibly. You may need to restore it to factory condition. Link-> Restore your iPhone, iPad, or iPod to factory settings - Apple Support

As the Beta is considered confidential and cannot be supported, you must be aware that we cannot help you further with beta issues beyond posting the link to uninstall it.

Apple Beta Software Program

Is the public beta software confidential?

Yes, the public beta software is Apple

confidential information. Don’t install the public beta software on any

systems you don’t directly control or that you share with others. Don’t

blog, post screen shots, tweet, or publicly post information about the

public beta software, and don’t discuss the public beta software with or

demonstrate it to others who are not in the Apple Beta Software

Program. If Apple has publicly disclosed technical information about the

public beta software, it is no longer considered confidential.

Read our Terms for full details

No Support and Maintenance; Future Products.  During

your participation in the Beta Program or in a particular seed, Apple

is not obligated to provide you with any maintenance, technical or other

support for the Pre-Release Software.  If,

at Apple’s option, such support is provided, it will be provided in

addition to your normal warranty coverage for your computer and/or

device.  You agree to abide by any support rules and policies that Apple provides to you in order to receive such support.  You

acknowledge that Apple has no express or implied obligation to announce

or make available a commercial version of the Pre-Release Software to

anyone in the future.  Should

a commercial version be made available, it may have features or

functionality that are different from those found in the Pre-Release

Software licensed hereunder.



On an iPhone 12 mobile data should work for updates if your carrier supports it. However, since you are having an issue, it's always advisable to try other options just to rule out potential issues with the cellular connection.

Try it over Wi-Fi and see if works. If it does, then you can contact your mobile service provider and tell them there is an issue with there mobile service.