I am experiencing with my EC25-E modem on the Jio 4G network in India.
Here is the sequence of AT commands and responses when attempting to initialize the modem:
GSM Init…
TX : AT
RX2 : RDY
TX : AT
RX1 : OK
TX : ATI
RX1 : Quectel EC25 Revision: EC25EFAR06A08M4G OK TX : AT+CPIN?
TX : AT+QCFG=“band”,0,4,0,0
RX1 : OK
TX : AT+CREG?0,0
RX1 : +CREG: 0,1 OK
TX : AT+CREG?
RX1 : +CREG: 0,1 OK
TX : AT+CREG?
RX1 : +CREG: 0,1 OK
TX : AT+CREG?
RX1 : +CREG: 0,1 OK
TX : AT+CSQ
RX1 : +CSQ: 20,99 OK
TX : AT+CBC
RX1 : +CBC: 0,85,3997 OK
TX : AT+COPS?
RX1 : +COPS: 0,0,“JIO 4G Jio”,7 OK
TX : AT+CGDCONT=1,“IP”,“internet”
RX1 : OK
TX : ATD+918459769590;
RX2 : ERROR
TX : ATH0
RX1 : OK
Despite inserting a Jio 4G SIM card with an appropriate recharge plan, I encountered an error (ERROR) while attempting to dial a number (ATD+918459769590;). Additionally, sending an SMS was not successful.