If you have access to the device locally - you can verify the set password for SMS via configurator
If you have access to communicate with Fota Web, you can download the configuration file and check the SMS password set.
Please contact with 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 firstname.lastname@example.org