BG96 Cat-NB1 Connection Registration Denied

I sent the following commands to connect to the NB-IOT network with BG96. My sim card is TR Turkcell. AT + CEREG? command returns registration denied.

1- AT + CFUN = 0.0
OK
2- AT + QCFG = “nwscanseq”, 03.1
OK
3- AT + QCFG = “nwscanmode”, 3,1
OK
4- AT + QCFG = “iotopmode”, 1,1
OK
5- AT + QCFG = “band”, 0.0,80000
OK
6- AT + CFUN = 1.0
OK
7- AT + QCOPS = 4.1
+QCOPS: “CAT-NB1”, “TR TURKCELL”, “28601”, “LTE BAND 20”, 65535, FFFF, C4, -97, -110.12
8- AT + QNWINFO
+QNWINFO: No Service
9- AT + COPS = 0,0, “Turkcell”, 9
OK
10- AT + QNWINFO
+QNWINFO: No Service
11- AT + QENG = “servingcell”
+QENG: “servingcell”, “SEARCH”
12- AT + QCOPS = 4.1
+QCOPS: “CAT-NB1”, “TR TURKCELL”, “28601”, “LTE BAND 20”, 65535, FFFF, 0,0,0,0
13- AT + CEREG?
+CEREG: 0.3
14- AT+QNWINFO
+QNWINFO: “CAT-NB1”,“28601”,“LTE BAND 20”,6446
15- AT+CEREG?
+CEREG: 0,3

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Is there a problem in the codes? Or could there be a problem with the operator?

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Hi Sakar,
I’m also facing the same issue! Where you able to solve this? If so, can you please let me help through it.

since you do not know the band info of the operator , pls do not lock band and enable all band with the below AT

AT+QCFG=“BAND”,0,400A0E189F,A0E189F // enable Any frequency band

AT+QCFG = “emmcause” // to get the error code of register .