JimmyJohnston
This situation may be due to several reasons.
1) The problem is on the side of the mobile operator (SIM card).
2) Lack of balance on the SIM card.
3) Traffic limit.
4) The device is in a shielded room and therefore there is no communication.
5) Incorrect or lost tracker settings.
6) The tracker does not have enough charge and it stores data in a black box until it is connected to a power source.
If you have further questions please write to us at support@gps-trace.com with the login, unit ID, screenshot of device configuration (SMS commands and device’s answers) and link to this topic, then we will try to check additionally and help you.