I am using a traditional physical SIM card. Yesterday i locked the tower to 4g main cell and i remained connected to the 5gnsa until an hour ago. This time it didn't revert to 3g, but just lost the connection until i unlocked. Then it was connected to 3g. After that i rebooted the modem and currently i am connected to 4G via national roaming.
I exported modem debug json but i cannot upload it here
{
"msgs": [
{
"cmd": "AT",
"result": "\r\nOK\r\n"
},
{
"cmd": "ATI",
"result": "\r\nQuectel\r\nRM520N-GL\r\nRevision: RM520NGLAAR03A04M4G\r\n\r\nOK\r\n"
},
{
"cmd": "AT+GMI",
"result": "\r\nQuectel\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CIMI",
"result": "\r\n219020101621152\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CPIN?",
"result": "\r\n+CPIN: READY\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CREG",
"result": "\r\nOK\r\n"
},
{
"cmd": "AT+CSQ",
"result": "\r\n+CSQ: 28,99\r\n\r\nOK\r\n"
},
{
"cmd": "AT+GSN",
"result": "\r\n016442006784975\r\n\r\nOK\r\n"
},
{
"cmd": "AT+COPS?",
"result": "\r\n+COPS: 0,0,"HT HR",7\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QGMR",
"result": "\r\nRM520NGLAAR03A04M4G_01.204.01.204\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CSUB",
"result": "\r\nSubEdition: V01\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QMBNCFG="list"",
"result": "\r\n+QMBNCFG: "List",0,1,1,"ROW_Commercial",0x0A010809,202401151\r\n+QMBNCFG: "List",1,0,0,"TEF_Spain_Commercial",0x0A010C00,202302071\r\n+QMBNCFG: "List",2,0,0,"FirstNet",0x0A015300,202206171\r\n+QMBNCFG: "List",3,0,0,"Rogers_Canada",0x0A014800,202303141\r\n+QMBNCFG: "List",4,0,0,"Bell_Canada",0x0A014700,202409201\r\n+QMBNCFG: "List",5,0,0,"Telus_Jasper_Canada",0x0A01F900,202304281\r\n+QMBNCFG: "List",6,0,0,"Telus_Consumer_Canada",0x0A01FA00,202304281\r\n+QMBNCFG: "List",7,0,0,"Commercial-Sprint",0x0A010204,202111051\r\n+QMBNCFG: "List",8,0,0,"Commercial-TMO",0x0A01050F,202402061\r\n+QMBNCFG: "List",9,0,0,"VoLTE-ATT",0x0A010335,202206171\r\n+QMBNCFG: "List",10,0,0,"CDMAless_Private-Verizon",0x0A01FD28,202409201\r\n+QMBNCFG: "List",11,0,0,"CDMAless-Verizon",0x0A010126,202409201\r\n+QMBNCFG: "List",12,0,0,"Swiss-Comm",0x0A010411,202304261\r\n+QMBNCFG: "List",13,0,0,"Telia_Sweden",0x0A012400,202111051\r\n+QMBNCFG: "List",14,0,0,"TIM_Italy_Commercial",0x0A012B00,202111051\r\n+QMBNCFG: "List",15,0,0,"France-Commercial-Orange",0x0A010B21,202409181\r\n+QMBNCFG: "List",16,0,0,"Commercial-DT-VOLTE",0x0A011F1F,202409181\r\n+QMBNCFG: "List",17,0,0,"Germany-VoLTE-Vodafone",0x0A010449,202401201\r\n+QMBNCFG: "List",18,0,0,"UK-VoLTE-Vodafone",0x0A010426,202401201\r\n+QMBNCFG: "List",19,0,0,"Commercial-EE",0x0A01220B,202409041\r\n+QMBNCFG: "List",20,0,0,"Optus_Australia_Commercial",0x0A014400,202111051\r\n+QMBNCFG: "List",21,0,0,"Telstra_Australia_Commercial",0x0A010F00,202311071\r\n+QMBNCFG: "List",22,0,0,"Commercial-LGU",0x0A012608,202111051\r\n+QMBNCFG: "List",23,0,0,"Commercial-KT",0x0A01280B,202308031\r\n+QMBNCFG: "List",24,0,0,"Commercial-SKT",0x0A01270A,202111051\r\n+QMBNCFG: "List",25,0,0,"Commercial-Reliance",0x0A011B0C,202210211\r\n+QMBNCFG: "List",26,0,0,"Commercial-SBM",0x0A011C0B,202409021\r\n+QMBNCFG: "List",27,0,0,"Commercial-KDDI",0x0A010709,202401191\r\n+QMBNCFG: "List",28,0,0,"Commercial-DCM",0x0A010D0D,202312201\r\n+QMBNCFG: "List",29,0,0,"VoLTE-CU",0x0A011561,202310181\r\n+QMBNCFG: "List",30,0,0,"VoLTE_OPNMKT_CT",0x0A0113E0,202312141\r\n+QMBNCFG: "List",31,0,0,"Volte_OpenMkt-Commercial-CMCC",0x0A012010,202408281\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QENG="servingcell"",
"result": "\r\n+QENG: "servingcell","NOCONN","LTE","FDD",219,01,B752109,174,500,1,5,5,1004,-95,-7,-60,20,15,90,-\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QENG="neighbourcell"",
"result": "\r\n+QENG: "neighbourcell intra","LTE",500,174,-7,-95,-59,-,-,-,-,-,-\r\n+QENG: "neighbourcell inter","LTE",6300,174,-13,-73,-52,-,-,-,-,-\r\n+QENG: "neighbourcell inter","LTE",6300,176,-16,-79,-52,-,-,-,-,-\r\n+QENG: "neighbourcell inter","LTE",1300,174,-7,-86,-70,-,-,-,-,-\r\n+QENG: "neighbourcell inter","LTE",1300,176,-20,-100,-69,-,-,-,-,-\r\n+QENG: "neighbourcell inter","LTE",1450,174,-8,-93,-78,-,-,-,-,-\r\n+QENG: "neighbourcell inter","LTE",1450,176,-20,-107,-78,-,-,-,-,-\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QCFG="usbnet"",
"result": "\r\n+QCFG: "usbnet",0\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QNWPREFCFG="mode_pref"",
"result": "\r\n+QNWPREFCFG: "mode_pref",AUTO\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QNWPREFCFG="nsa_nr5g_band"",
"result": "\r\n+QNWPREFCFG: "nsa_nr5g_band",1:2:3:5:7:8:12:13:14:18:20:25:26:28:29:30:38:40:41:48:66:70:71:75:76:77:78:79\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QCFG="pcie/mode"",
"result": "\r\n+QCFG: "pcie/mode",0\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QCFG="data_interface"",
"result": "\r\n+QCFG: "data_interface",1,0\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QCAINFO",
"result": "\r\n+QCAINFO: "PCC",500,100,"LTE BAND 1",1,174,-95,-7,-60,20\r\n+QCAINFO: "SCC",1300,100,"LTE BAND 3",1,174,-86,-7,-70,14,0,-,-\r\n+QCAINFO: "SCC",1450,50,"LTE BAND 3",1,174,-93,-8,-78,18,0,-,-\r\n+QCAINFO: "SCC",6300,50,"LTE BAND 20",1,174,-73,-13,-52,12,0,-,-\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CEREG?",
"result": "\r\n+CEREG: 0,1\r\n\r\nOK\r\n"
}
]
}