iPhone showing full LTE bars but no internet

My LTE signal is full, but no internet connection. I try to airplane mode and turning back on, restart it, let him turn off for low battery etc, but nothing changed, the only thing that appears to me when I tun of/on the internet connection is "LTE" for one second adn after nothing. My internet connection on LTE is normal, but i can't connect to internet, this problem started today when my phone did an automatic upgrade to IOS 17.4, and other problem like: no Hotspot option or the voicemail. What can i do to fix these problems?

[Re-Titled by Moderator]