iPhone 12 randomly has no internet connection after updating to iOS 14.6

I have the same issue, only it's an iPhone 11.

I did restore from a backup, reset network settings, three soft resets. Nothing worked so far.

Also, it's not just on wifi. 4G also doesn't work. my iPad was also updated to iPadOS 14.6 and it's working fine.

After 14.6 update on an old iPhone 7 my data connection was off and on with and without WiFi? While playing a game of pool my phone randomly shuts down and then no service whatsoever? It tells me I have to update however there is no update? I’ve been disappointed once or twice with the IPhone however nothing to where I’m considering never again purchasing another product! This is some aggravating times. And they say it’s defective or damage in the device well being in a protective otter box case and working in my hand playing pool on the internet and all of a sudden this happens? Hmmm? A week after my 1 year warranty is up? I’m not sure Apple but you need to get it together.

Try the steps here:

https://support.apple.com/en-us/HT204051#:~:text=Reset%20your%20Network%20Settings.,that%20you've%20used%20before.

If they don't help try Restoring from a backup.

https://support.apple.com/en-us/HT204184

I have an iPhone 11 software 14.7 and XR 14.6 and both of them do the same thing. I did a Network Reset on both devices and still acting up. The iPhone 11 is on the AT&T network, and the XR is unlocked on the T-Mobile network. The T-Mobile XR is my personal device, other one is for work, both devices are using my apple id and also imessage to send and receive messages. I've never seen this before, if I shut WiFi off it still does it randomly. It's frustrating because here you are sending messages and then finding out the unit says no internet service, but at the time you send messages you have you have internet. Hopefully we can find a solution out there.

Folks I think we found the solution, check that your FB messenger is enabled in Settings>>>Cellular. Every other app we installed is enabled but the Facebook messenger wasn't enable. So far so good now.

waiting for the solution too. I called apple and they want me to be without my cell phone for at least 2 weeks to get this checked.