Hello cccf,
Thanks for that info and for choosing the Apple Support Communities. If I understand correctly, you are unable to connect to cellular data on your iPhone. To help with this, please follow the steps in these Apple resources:
Make sure that you are running the latest iOS update, which at the time of this writing is iOS 13.1.2:
Update your iPhone, iPad, or iPod touch
Then make sure you check for and install any carrier updates:
Update your carrier settings on your iPhone or iPad
Afterwards, restart your iPhone
Restart your iPhone, iPad, or iPod touch
Then go to Settings > General > Reset > Reset Network Settings - Please note that this also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that were used before.
Cheers!