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A: Possible causes:
Check if the SIM card is normal.
Check if the SIM card is not in service.
Check if the 4G antenna is connected as intended.
Check if the 4G signals are strong enough.
Try out with another SIM card.
20) Q: 4G platform is not online.
A: Possible causes:
Check if 4G dial-up is normal.
Check if local active registration is correctly set up.
Check if the sever terminal is correctly set up.
21) Q: No GPS data.
A: Possible causes:
Check if the GPS antenna is connected as intended.
Make sure the GPS antenna is in a place where signals are not blocked.
22) Q: GPS drifting and produces speed for no reason.
A: Possible causes:
Weak GPS signal.
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