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I've bought SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4 ( with an holohram SIM card and I have tried the example code to register operators with Arduino as explained in the hookup guide ( ... 1542220466).

It detects only two operators that are not compatible with hologram SIM cards (TELUS and Bell).

I have tried putting the SIM card in my cellphone and it can easily detects the allowed operators (Rogers and Videotron).

I have also tried with another SIM card from my provider in the shield and I still detect the same operators (TELUS and Bell).

I am in Quebec City, Canada and from what I know and from the test I made, I should be able to detect all operators...

Any idea about that?