LDDS75 NB - failed to read IMSI number

[Martin Bettler]

Hi all,

I use several LDDS75 NB devices, equipped with 1NCE SIM cards.

Unfortunately, sometimes the devices stop sending data.

When checking the serial meassages, the following error is shown:

Failed to read IMSI number.

The problem is present with at least 3 devices. 

Sometimes the devices will start working again.

I checked the obvious things like SIM card inserted correctly etc.

Any help is appreciated!