you can pm here trackinguser445 at gmail
Most good trackers will allow reconfiguration by send the appropriate SMS text msg
right, i think that was what anton was saying go to the device manufacturer direct..there are some solutions.
https://doc.ruptela.lt/pages/viewpage.action?pageId=2129929&preview=/884781/1446131/EN%20Device%20configuration%20via%20SMS.pdf
you can pm here trackinguser445 at gmail