I am trying to make calls and send texts from the GSM modem, but when I try to make a call it says "No Carrier" I cant seem to fix the problem or figure out what is wrong. Please help me trouble shoot the problem!!
at+cnum
+CNUM: "","16108647718",129,7,4
OK
AT+COPS=?
+COPS: (2,"T-Mobile ","T-Mobile ","310260"),(1,"AT&T","AT&T","310410"),,(0-4),(0-2)
OK
ATD 6107938274;
OK
NO CARRIER
Your SIM is for which operator? Suppose it is for T-mobile, you can try
at+cops=1, 2, "310260"
If it failed, then you may try with
at+cops=0
My guess is your modem is keeping some wrong information about the operator...