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