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I got two modems (dev boards) Siemens TC35 and SIM900A and I cannot get them to send sms.
From the research (AT response) it seems that somehow sim cards will not register to network.
I bought three sim cards from different networks currently operating in my location.
Commands to GSM module:
of course further AT didn't work also.....
All SIM cards have their pin security check disabled. All cards have been inserted into phone, tested for a call and tested to send SMS to another phone. Also all of them all full of credit.
Any hints?
From the research (AT response) it seems that somehow sim cards will not register to network.
I bought three sim cards from different networks currently operating in my location.
Commands to GSM module:
Code:
AT
OK
AT+CREG?
+CREG: 1,0
OKof course further AT didn't work also.....
Code:
AT+CMGF=1
OK
AT+CMGS="+385xxxxxxxxx"
> test (CTRL-Z)
+CMS ERROR: 302All SIM cards have their pin security check disabled. All cards have been inserted into phone, tested for a call and tested to send SMS to another phone. Also all of them all full of credit.
Any hints?