Check SIM CCID
You can verify that the SIM is inserted and correct by reading the CCID, which is the
unique identifier printed on it with C
Network Test
Check RSSI (network signal strength)
You can ask the FONA for the signal strength with the command i. The reply is a
number, but you can convert it to dBm. Try to have the signal strength higher than 5 in
order to make calls, SMSs, etc. In this case, I've got a 10
©Adafruit Industries
Page 42 of 58
