Connecting Nokia 106 to Arduino
Here's the picture of the Nokia FBUS connector from your link:
  

And here's a (slightly dubious) method of connection from some random web page
  

which goes on to say


  The F-bus protocol uses 115,200bps so we can easily use the Arduino’s serial function to communication with the phone. All you need to is hook up the phones TX to the Arduino’s RX and then use a resistor divider (I choose 330 ohm resistors) to connect the Arduino’s TX to the phones RX as shown above.


That page goes on to show how to use an Arduino to get the phone to send SMS text messages.

Sources:  


http://www.insidegadgets.com/2013/01/12/how-to-use-nokia-f-bus-to-send-an-sms-message/
http://forum.gsmhosting.com/vbb/f148/nokia-105-new-100-working-solution-1731398/