I have an EM7455, which I have been using successfully on the Vodacom network in South Africa. Recently, I got some SIM’s for the Rain network, which operates on LTE Band B7 2600, to my understanding.
I tried 3 different SIM cards, and was unable to register with the network.
Worse, now when I put the original Vodacom SIM back in the modem, it also cannot register with the network!
It seems to me that the SIM or SIM card reader is the problem, as I get the following error message from the modem:
rogan@nemesis:~$ sudo qmicli -p -d /dev/cdc-wdm0 --dms-get-msisdn
error: couldn’t get MSISDN: QMI protocol error (37): ‘UimUninitialized’
That would also explain why I was unable to register with the Rain network, if the SIM could not be read.
Any suggestions as to how I can verify that this is indeed the problem?
I have removed and reinserted the SIM, and checked repeatedly that it is the right way up, etc, etc. This is on a Thinkpad P51 running Ubuntu 16.04LTS, if that makes any difference.
I have also upgraded the firmware to the latest version I could find, being SWI9X30C_02.30.01.01_Generic_002.045_001.zip