Mobile commerce is growing rapidly, with the market in the US expected to triple to $31 billion by 2015. Smartphone usage is also increasing significantly in both the US and Australia, with over 90% of Australians expected to use smartphones by 2015. Mobile purchasing is also on the rise, with over a third of Americans and a quarter of Australians having made purchases on their smartphones. The mobile commerce market is expected to explode in the coming years.