I insrteted my sim and phone/messaging works fine, but the phone did not record my number from the sim and mobile internet does not work. There does not appear to be an APN facility nor an LTE facility. Operating Android 9 Pie.
Can you help?
There is definitely a section for setting the APNs on your device.
Enter Settings > Network & Internet > Mobile network > Advanced > Access point names (APNs)
To be able to write an answer you must first register!