No default IMEI read out by "AT+CGSN=1" at NRF9151

[Jeffery]

Dear Nordic

Q1.

We tried new nrf9151 IC at custom board.

IC version:   nrf9151 AEA (Engineering B)

Firmware:    ncs2.7.0 Serial LTE modem application + mfw_nrf91x1_2.0.2.zip

Most of AT commands can work, except "AT+CGSN=1" as below. It cannot read IMEI.

AT+CGSN=1
ERROR

Same firmware at NRF9151 DK board (v0.9.0, A0A version). This command can work.

AT+CGSN=1
+CGSN: "355025930012115"
OK

Why? At document, it said NRF9151 support default IMEI. 

Or, NRF9151 AEA version didn't support default IMEI?

Q2. 

Then we also tried IMEIWRITE, followed below link

 Unable to write IMEI using %IMEIWRITE to nrf9161 

The result was error

AT%IMEIWRITE=0,"355025930012115"
%IMEIWRITE: ERROR

Why? 

Shall I apply IMEI at nrf cloud in advance. Or, I can fill any 15-digit number?

Thanks for question 1 and 2.

Jeff

[Charlie]

Hi,

Thanks for reaching us for your questions. Here are the replies:

Q1: Development kits (DKs) and Thingy devices are delivered with pre-programmed IMEIs, so you do not need to order IMEIs for them. For your custom board, you need to decide to use IMEI from Nordic or your own company.  

Q2: IMEI is not random number, you need to apply from GSMA if you want to have your own. For prototype builds and production-grade batches under 100k devices, you can use nRF Cloud to order Nordic IMEIs for your devices.

nRF9151 LACA AEA is one engineering version according to SiP revisions and variants, so it is not very clear if it has already programed a IMEI. I suggest you swith to formal nRF9151 LACA A0. According to Write IMEI %IMEIWRITE, nRF9151 LACA A0 module includes a default IMEI alerady and also can be changed once with the %IMEIWRITE command.

Best regards,

Charlie

[Jeffery]

Hi Charlie

Since we only had one nRF9151 LACA AEA which mounted on our customer board, could we use #IMEIWRITE at this engineering version to solve CGSN error?

If yes, pti modem 2.3.6 was allowed at AEA version? or, other pti version?

Jeff 

[Charlie]

Hi Jeff,

It doesn’t hurt to try following the document I mentioned earlier. If that doesn’t work, you have to move forward with the nRF9151 LACA A0.

Let me know how it goes.

Best regards,
Charlie