Wifi/Bluetooth with Arduino

Hello ..!

Is there a way to connect to the arduino and make my cellphone as a mobile joystick ?

Doesn't matter to me if it Will be Via wifi or Bluetooth...

Whats matter is that in my phone will be a thomb joystick and not to connect any wire between the arduino and my cellphone

Is it possible ?
Thanks..

P.s
And if it does possible ,

What should i buy to my arduino ?

http://forum.arduino.cc/index.php?topic=173246.0

Buy an HC-05, about $3-50.