After the numerous botnets over "everything" (botnet over IRC, botnet over skype, botnet over twitter, over facebook... ) , directly from one of the most fascinating hacker (Georgia Weidman) an android botnet over SMS.
This is a great example of Botnet spread and controlled by invisible SMS.
Download the code from here.
Compile with arm-gcc with the -static flag set
Copy to anywhere on the underlying OS that is writable (/data/ is good).
Rename /dev/smd0/ to /dev/smd0real/
Start the bot application
Kill the radio application (ps | grep rild)
The radio will automatically respawn and now the bot proxy will be working
Take a look of what it can do.
Shmoocon 2011 Smartphone Botnets over SMS Demo from Georgia Weidman onVimeo.