Thank you for your response Didneywhorl
The router I am using it netgear r7000 with r00ter firmware.
Yes I put the SIM card in the usb adapters SIM slot.
executed the following command in Modem-->>Miscellaneous-->>AT Command Terminal
I set the APN under Modem -->> Connection Profiles -->> General tab
apn= r.ispsn
Authentication Protocol = none
connected to internet , very slow though and keeps disconnecting is there any tutorial for me to change to connect to better towers.
Following is the modem debug information :
Sat May 16 22:38:22 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
Sat May 16 22:38:22 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
Sat May 16 22:38:36 2020 : /dev/ttyUSB2
Sat May 16 22:38:36 2020 : /dev/ttyUSB Can't open device /dev/ttyUSB.
Sat May 16 22:38:37 2020 : /dev/ttyUSB Can't open device /dev/ttyUSB.
Sat May 16 22:38:38 2020 : /dev/ttyUSB Can't open device /dev/ttyUSB.
Sat May 16 22:38:39 2020 : /dev/ttyUSB Can't open device /dev/ttyUSB.
Sat May 16 22:38:40 2020 : /dev/ttyUSB Can't open device /dev/ttyUSB.
Sat May 16 22:38:42 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
Sat May 16 22:38:42 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
Sat May 16 22:38:42 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
AT+QCFG="nwscanmode"
+QCFG: "nwscanmode",3
OK
AT+QTEMP
OK
+QTEMP: "xo_therm_buf","37"
+QTEMP: "mdm_case_therm","37"
+QTEMP: "pa_therm1","37"
+QTEMP: "tsens_tz_sensor0","39"
+QTEMP: "tsens_tz_sensor1","39"
+QTEMP: "tsens_tz_sensor2","39"
+QTEMP: "tsens_tz_sensor3","39"
+QTEMP: "tsens_tz_sensor4","39"
AT+CNMI=0,0
OK
Sat May 16 22:42:53 2020 : /dev/ttyUSB2 AT+CPMS="SM"
+CPMS: 0,0,0,0,0,0
OK
Sat May 16 22:43:00 2020 : /dev/ttyUSB2 AT+CSQ
+CSQ: 18,99
OK
AT+QENG="servingcell"
+QENG: "servingcell","NOCONN","LTE","FDD",310,120,C623111,238,8615,25,4,4,2F8A,-104,-9,-72,13,0,-32768,-
OK
AT+QNWINFO
+QNWINFO: "FDD LTE","312530","LTE BAND 25",8615
OK
AT+QCAINFO
OK
AT+QCFG="nwscanmode"
+QCFG: "nwscanmode",3
OK
AT+QTEMP
OK
+QTEMP: "xo_therm_buf","37"
+QTEMP: "mdm_case_therm","37"
+QTEMP: "pa_therm1","36"
+QTEMP: "tsens_tz_sensor0","39"
+QTEMP: "tsens_tz_sensor1","39"
+QTEMP: "tsens_tz_sensor2","39"
+QTEMP: "tsens_tz_sensor3","39"
+QTEMP: "tsens_tz_sensor4","39"
AT+CNMI=0,0
OK
Sat May 16 22:43:04 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
Sat May 16 22:43:04 2020 : /dev/ttyUSB2 Can't open device /dev/ttyUSB2.
-------------------------
Following is the connection log keeps disconnecting.
Sat May 16 22:54:20 2020 : Connection Log Cleared by User
Sat May 16 22:54:55 2020 : Disconnect (Removed) Modem #1
Sat May 16 22:55:33 2020 : Attempting to Connect Modem #1 (Quectel EM12-G)
Sat May 16 22:55:38 2020 : Modem #1 Connected (Quectel EM12)
Sat May 16 22:56:36 2020 : Disconnect (Removed) Modem #1
Sat May 16 22:57:14 2020 : Attempting to Connect Modem #1 (Quectel EM12-G)
Sat May 16 22:57:19 2020 : Modem #1 Connected (Quectel EM12)
Sat May 16 22:58:05 2020 : Disconnect (Removed) Modem #1
Sat May 16 22:58:26 2020 : Disconnect (Removed) Modem #1
Sat May 16 22:58:46 2020 : Disconnect (Removed) Modem #1
Sat May 16 22:59:26 2020 : Attempting to Connect Modem #1 (Quectel EM12-G)
Sat May 16 22:59:31 2020 : Modem #1 Connected (Quectel EM12)