Datasheet

ATI - Get the module name and revision

AT+CMEE=2 - Turn on verbose errors (handy for when you are trying out commands!)

AT+CCID - get the SIM card number - this tests that the SIM card is found OK and you can verify the number is written

on the card

Test Setup

Some tests to verify the setup

AT+COPS? Check that you're connected to the network, in this case T-Mobile

AT+CSQ - Check the 'signal strength' - the first # is dB strength, it should be higher than around 5. Higher is

better. Of course it depends on your antenna and location!

AT+CBC - will return the lipo battery state. The second number is the % full (in this case its 92%) and the third

number is the actual voltage in mV (in this case, 3.877 V)

Test Send SMS

Finally, you can try to text your phone! Sending an SMS is pretty darn easy.

If your SIM card is locked with a PIN code, you will need to enter the pin before you can connect to a network

via the 'AT+CPIN' command. For example if the pin is 1234 you need to enter 'AT+CPIN=1234".