Thank you for your reply. I am aware of that. The NB-IoT UE is going to connect to my own SDR-based NB-IoT femto cell. I just need to make AT+CFUN=1 to work with my Test SIM card the same way it did work with my mobile carrier's SIM card. I don't want to register to any NB-IoT network for now, just the AT+CFUN=1 command to work. In addition, my mobile carrier's SIM doesn't support NB-IoT, it is just a regular SIM card and AT+CFUN=1 worked with that regular SIM card without registering to NB-IoT or LTE network (AT+CEREG? returned 0, not connected).
I want to have the same functionality with my SIM test Card and I can't figure out why it works with mobile carrier's SIM card but not with my Test SIM card. Once I make AT+CFUN=1 work, I can configurate SDR software and UE database files so that SODAQ UE registers to my own NB-IoT femto cell.
Keep in mind that since SDR is used, I am both network operator and user. Therefore after AT+CFUN=1 returns OK which is just full radio functionality of ublox module enabled, I will make UE register to my NB-IoT network.
What type of SIM must I insert in SODAQ NB-IoT Shield for that ? USIM , CSIM or ISIM ?
Thank you for your time.