document setup (beginning only)

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@@ -1,6 +1,30 @@
-# usb network
+# sxmo - send sms to activate ssh remote port forwarding
+
+First, let me start with a use case: I want to send sms from my phone to sim card
+at remote location which will then bring up mobile network data and establish
+remote ssh port forwarding to external host using new mobile connection so I can
+log in back into network which lost it's connectivity with internet.
+
+I spent way too much time trying to solve this, mostly because I didn't try
+[sxmo](https://sxmo.org) which is exactly what I needed for this job.
+
+## device
+
+For device, I was fortunate than I had pinephone, one of 
+devices supported by postmarketos](https://wiki.postmarketos.org/wiki/Devices)
+
+# postmarketos usb network setup
 
 After plugging it in with usb cable, I configure usb network (which
 changes device on every reboot of pinephone) with [pm-net.sh script](pm-net.sh)
 
 Default password is **147147** which you will also need if you want to unlock device.
+
+# find out sim card number
+
+If you don't know phone number of this card, now you can
+send test sms message to your number:
+```
+/usr/bin/sxmo_modemsendsms.sh +385912345678 "test sms"
+```
+