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= Sending commands to the SIM device
To send commands to the SIM device, use a program called `minicom`. For example:
minicom -D /dev/ttyS0
`minicom` connects to the SIM device, which is represented by `/dev/ttyS0`, and
then allows you to start typing commands. To submit a command, press <Enter>.
`/dev/ttyS0` is the name that this computer has given to the SIM device. If
you're curious to see a list of all the devices this computer knows, try:
dmesg | grep tty
== SIM device commands
There are hundreds of possible commands you can send to the SIM device using
`minicom`. Here are two.
=== Entering Text Mode
AT+CMGF=1
This enters Text Mode. It is much easier to send, list and receive texts if you
are in Text Mode.
=== Sending a text
AT+CMGS="+447123456789"<Enter>
Your message<Ctrl+Z>
That sends a text message with the content "Your message" to the phone number,
+44 7123 456789. If you want to send to a different number, just replace
the number. Be careful to make sure the number starts with +44, doesn't contain
any spaces and is inside "double quotes".
You need to be in Text Mode to use this command effectively.
If you want to cancel a text without sending, use <Escape> instead of <Ctrl+Z>.
=== Reading texts
AT+CMGL="ALL"
This reads all texts. You can also read a specific text:
AT+CMGR=5
This reads the text with the index number 5. If you want to read a different
text, use a different index number.
It is much easier to read texts if you are already in Text Mode.
=== Receiving texts
When you receive a text, if you are in minicom, you will get a notification. It
will look like this:
+CMTI: "SM",3
That means you got a text and it is stored in index number 3.
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