I use GSM-module WISMO228. I can call, send and receive SMS. But there is problem with several SIM-cards.
- Periodically I send AT-command^
AT+CREG? +CREG: 1,1 OK AT+CREG? +CREG: 1,1 OK
And this is working OK.
- Then I’m trying to make voice call: (instead of x there is real numbers)
Then I’m waiting answer, but the module is silent.
Then I send command from paragraph 1:
AT+CREG? ERROR ERROR ERROR
That is module answer ERROR for each command.
There is only one way to exit from this state, this is reset the module.
How can I make the voice call, if AT-command ATD not working?
How can I detect this type of SIM-card?