I just received my hologram.io SIM card and have been attempting to get it to work with an SIM800L connected to an Arduino.
The GSM module that I am using is: Wangdd22 Mini A6 GPRS GSM Kit Wireless Extension Module Board Antenna Tested Super SIM800L
I believe that I have everything wired up and working correctly and I am passing AT commands through and receiving responses. However, I don’t seem to be connected to the cell network. After establishing my serial connection I see:
To me this looks like “registration denied”. I can do an AT+CREG? and get:
Executing AT+CGATT=? gives me:
And I am able to:
But when I try AT+CGATT=1 I get:
which I believe means “Requested facility not subscribed”. Is it possible that my SIM has not been properly registered?
I was hoping that I’d be able to just do something like the following to start sending SMS messages:
AT+CSTT="hologram","","" AT+CSCS="GSM" AT+CGATT=1 AT+CMGF=1 AT+CMGS="+15551231234" > This is a test message
But I only get as far as the AT+CMGF=1 before receiving “ERROR”.
My SIM is listed under Devices in the Hologram.io Dashboard and the status is “Live”.
Does it look like I’m doing this wrong, or is it possible that my SIM just isn’t registered somehow? Or maybe the above indicates a misuse of the modem?
Thanks in advance!