Hello, good day
If you made sure that GNSS Source is configurated in System tab, the GPRS settings were configurated in the GPRS tab to connect with the local operator, the GPS operators you are using are not in the Operator black list on GSM Operator tab, and still the devices have no reached GPS location, it would require further analysis.
For that, please contact your sales manager. If you don't have any contacts with our Sale managers, please contact with them on our official website
https://teltonika-gps.com/ and click on the "Contact Us" button. When you will click, please fill the form and submit it. Note: as a topic, please choose "Vehicle telematics". Or you can send an e-mail with description of your situation to info@teltonika.lt When contacting Us, please provide: IMEI/Logs/Configuration file/Intenational GSM number/Firmware version/ect, please follow these recommendations:
https://wiki.teltonika-gps.com/view/Recommendations_for_filling_a_query_description
Best regards.