at+cops=? sim300
I have a problem with SIM300 GSM module. SIM300 could not recognize some SIM cards. I supposes, that it is a new SIM cards with extended memory. Module can't get register to GSM network.
Example below for normal SIM cards:
------------------
+CREG: 2
RDY
+CFUN: 1
+CPIN: READY
+CREG: 1
at+cops?
+COPS: 0,0,"MTS"
OK
at+ccid
89701011600008009301
OK
------------------
And for not working SIM cards:
------------------
+CREG: 2
RDY
+CFUN: 1
+CREG: 0
at+ccid
00000000000000000000
OK
at+cops?
+COPS: 0
OK
------------------
From these examples we can see that SIM300 is pass to registered stage, but then it give message that it not registered. On the other hand this SIM card is working in GSM phone.
Dear pisoiu, could you please explain what the problem and how I can solve this problem?:?: