Here is the debug from when I run the cmd, you can see at the bottom it connects to LTE as my PCC and then the two SCC, one of which is the 5G I wanted, below that it says the EPS registration is successful so for me it seems to work as I'm on the tower I want and its not dropped.
{
"msgs": [
{
"cmd": "AT",
"result": "\r\nOK\r\n"
},
{
"cmd": "ATI",
"result": "\r\nQuectel\r\nRM520N-GL\r\nRevision: RM520NGLAAR03A03M4G\r\n\r\nOK\r\n"
},
{
"cmd": "AT+GMI",
"result": "\r\nQuectel\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CIMI",
"result": "\r*\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: 27,99\r\n\r\nOK\r\n"
},
{
"cmd": "AT+GSN",
"result": "\r***\r\n\r\nOK\r\n"
},
{
"cmd": "AT+COPS?",
"result": "\r\n+COPS: 0,0,"3",13\r\n\r\nOK\r\n"
},
{
"cmd": "AT+QCAINFO",
"result": "\r\n+QCAINFO: "PCC",9360,50,"LTE BAND 28",1,174,-88,-12,-58,4\r\n+QCAINFO: "SCC",1392,75,"LTE BAND 3",2,249,-104,-18,-69,3,0,-,-\r\n+QCAINFO: "SCC",641376,12,"NR5G BAND 78",928\r\n\r\nOK\r\n"
},
{
"cmd": "AT+CEREG?",
"result": "\r\n+CEREG: 0,1\r\n\r\nOK\r\n"
}
]
}