I’m testing the 3G version of this tracker and having some issues…
TK905 Car Vehicle GPS Tracker
https://www.amazon.com/dp/B078WYHW6C/ref=cm_sw_em_r_mt_dp_DC1M9ZHQVGPG4RBWMS9M?_encoding=UTF8&psc=1
I can use the SMS interface to communicate with the device and set the APN, but I can’t seem to get the GSM interface to activate, so I am limited to SMS communication.