... as in the garage, BUT there is GSM signal received from a GSM modem nearby, you can send the tracker ... The simcard should be a GSM network based ( ONLY GSM ). The tracker now CANNOT support 3G in theory. Why in ... as AU, US, UK, etc, there are ONLY 3G simcard can be found now. But the tracker CAN ... still perform normally with such 3G simcard, that is because these 3G simcard can support or compatible ...