I bought new USIM Card. It has not MSISDN written in the MSISDN list (Phone storage = "ON"). I tried to write MSISDN to the USIM card using AT commands of the modem (SIM800X GSM/GPRS HAT).
AT+CPBS=?
+CPBS: ("SM","ME","ON","FD")
AT+CPBS="ON"
AT+CPBS="ON"
OK
AT+CPBS?
AT+CPBS?
+CPBS: "ON",0,3
OK
AT+CPBW=,"+380501234567",145,""
AT+CPBW=,"+380501234567",145,""
ERROR
How can I to find out the reason of the error? Or what am I doing wrong?