I've installed iOS beta 4 on my iPhone 11 Pro and since then, I lost the signal and I don't have data. I have another iPhone X with iOS 14, and I don't have issue with it. It only occurs on iPhone 11.
I tried many things like:
Reset network setting
Turn off/on airplane mode
Turn off/on cellular data
Reset content and data
Turn off/on roaming
It seems that the cell is looking for the signal constantly.
Do you have any idea how to fix it ?