The biggest selling app of all time is a little game called Angry Birds, and with over 10 billion iTunes apps downloaded, mobile gaming is big business right now.

Price: From £193 | Apple

Positioned as a gaming device from the outset, perhaps nothing has done more to bring app gaming to a wider audience than the Touch. It’s the ideal gaming device for on the go: games are far, far cheaper than it’s console rivals, it fits in your pocket; and you’re free of the worry that if your battery dies you won’t be able to make phone calls.

Last September the Touch was upgraded, giving it front- and rear-facing cameras just like the iPhone, opening the gates for all kinds of augmented reality gaming possibilities. It's also got the same three-axis gyroscope as the iPad 2, and a mammoth 64GB of storage for hundreds of games. You’ll never have a dull bus journey again.