Thank you for contacting Teltonika Networks Crowd support community.
If the SIM card settings are not being held when you set them manually on your Rutx09 router, it is possible that there is an issue with the router's firmware or hardware.
Please check the following.
Check that the SIM card is seated properly in the SIM card slot. Make sure that it is fully inserted and that the contacts are facing down.
Check the SIM card for damage. If the SIM card is damaged or has become bent or distorted, it may not work properly.
Check the router's firmware version and make sure it is up to date. If the router's firmware is out of date, it may not be compatible with the SIM card.
Reset the router to its default settings and try setting the SIM card settings again.
Kind regards,
Shadrack.