Hello! I have iPhone XR version 14.3-14.4 beta, it's bad to receive LTE, only 3G is the norm. This was not the case before. Modem firmware 3.02.02.
I tried many things like:
Reset network setting
Turn off/on airplane mode
Turn off/on cellular data
Hard reboot
Soft reboot
Reset content and data
Turn off/on roaming
...
Same issues
Do you have any idea how to fix it ?