Hello. 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) ATD+…

Problem with the voice call

postnovvm September 30, 2013, 8:11am 6

Hi.
The problem was solved by updating firmware from version L20 to version L23.

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