I’m trying to connect the Hologram Nova using NB IoT in the US (Bay Area).
I’m able to connect the Internet in case I’m using LTE-M (-> at+URAT=7).
If LTE-M is enabled the module connects right away, with and without using the Hologram SDK.

But when I try to use only NB IoT (-> at+URAT=8) the module doesn’t connect to a network.

ati gives me:

Manufacturer: u-blox
Model: SARA-R410M-02B
Revision: L0. [Feb 03 2018 13:00:41]
SVN: 02
IMEI: 356726102472800

I’m pretty sure there should be NB IoT Reception in my Area as ‘AT+COPS=?’ returns this list:

+COPS: (3,“311 480”,“311 480”,“311480”,9),(1,“310 260”,“310 260”,“310260”,9),

and ‘at+csq’ returns

+csq: 14,99

I also tried to connect to AT&T (310410) manually (-> m.ex’at+cops=1,2,310410,9’) but it didn’t work out.

I don’t want to use the hologram SDK, as I need control over PSM and eDRX sittings and only wan’t to use NB-IoT for evaluation of the network.
I also tried to follow the ublox Guide https://www.u-blox.com/sites/default/files/SARA-R4-N4-Application-Development_AppNote_(UBX-18019856).pdf (Section 8.5.1), but it didn’t help me.

In some posts I read that the connection to the network with NB-IoT can take up to an hour. Does anybody have any experience in using only NB-IoT in the US or an Idea what I can try?

Thanks in Advance!

Hi, NB roaming is still in flux and so we don’t offer NB service with our SIMs at this time. If you do need it for your application, reach out to the support team and we’ll see if there’s anything we can do.

1 Like

Hey Reuben,

Thanks for your reply! I’ll contact the support.

Best Dominik