Yea if you have an android phone, you can get one first cheap, but as far as I know, you can't connect the bluetooth to iPhone, so you need a wifi one, thats why I went with the iOBD, that and I got it second hand off the forum
Does this torque app exist for iPhone, didn't see it in the App Store when I looked. The iOBD has a dedicated app which actually plots on a map your journey, plus time taken, distance, average MPG etc etc. I like it