The following phones are supported
Although DriveGain does run on the iPad we don't recommend using it to run the application. The iPad is too big to be safely mounted on the windscreen meaning you will have to look further away from the road which is not safe. We would definitely suggest using an iPhone or iPod Touch instead if you have one.
If you have an iPod Touch you will need a GPS capable holder such as the TomTom Car Kit to use the application. This is because the iPod Touch has no built-in GPS reciever so an external one is required. Since you also need a proper car mount to use the application anyway, a car kit like the TomTom is the best solution:
The TomTom Car Kit is available on Amazon: