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In order to ensure the 4G module works properly, the signal strength should
be at least 2 bars. If there is only one bar of signal, it may cause the sending
and receiving of the camera is not very well.
If a code other than the MPNO symbol shows up on the screen, it
indicates something is wrong. Specifically as:
WAIT…
：
Searching signal or no signal received.
NO MDM
：
The module is not found or detected.
SIM ERR
：
Please check if SIM card is inserted correctly.
REG ERR
：
Not registered, it is not currently in the state of
searching and registering a new operator, please check
whether the camera is locked to a specific frequency band
and there is no signal nearby, whether a private network is
used and APN information needs to be set.
REG RFU:
Registration rejected
REG UNK:
Unknown status, please check whether the SIM
card is password protected, whether the camera is locked to a
specific frequency band and there is no signal of the band
nearby,the account is in arrears or the network signal is too
poor.
DIAL ERR
：
The registration service has been completed, and
the dial-up may be unsuccessful due to poor network signal.
Please check if the antenna is damaged or if it is using the
antenna provided by manufacturer.
Mobile Operators
Signal
Signal