Any experience about using Arduino mkr nb 1500 in UK

Hi,
I am using Arduino MKR nb 1500 in UK with Hologram SIM card. I tried example sketches(NBScanNetworks) in Arduino, but they are unsuccessful. I tried to debug “NB nbAccess” and it looks like this:
NB IoT/LTE Cat M1 networks scanner
AT

OK
AT+CPWROFF

OK
AT

OK
AT+CMEE=0

OK
AT+CFUN=0

OK
AT+CPIN?

+CPIN: READY

OK
AT+CMGF=1

OK
AT+UDCONF=1,1

OK
AT+CTZU=1

OK
AT+CGDCONT=1,“IP”,""

OK
AT+UAUTHREQ=1,0

OK
AT+CFUN=1

OK
AT+CEREG?

+CEREG: 0,0

OK
AT+CEREG?

+CEREG: 0,0
And then loops again and again. What’s wrong with it? Thanks in advance!

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