1. Whether the SIM card balance is insufficient.2. SMS command format is incorrect. Follow the correct user manual3. SIM card does not support SMS.4. SIM card restrictions by the operator.5. Whether t
source:FAQ release time:2026-04-14 Hits: Popular:realtime gps tracker online
1. Whether the SIM card balance is insufficient.
2. SMS command format is incorrect. Follow the correct user manual
3. SIM card does not support SMS.
4. SIM card restrictions by the operator.
5. Whether the device in deep power-saving mode, switch to vibrate mode or real time mode.
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