The iPhone is biting into a significant chunk of the U.S. portable gaming market, according to Flurry data.
The following chart shows software revenue growth from 5 percent to 19 percent for games on the iPhone OS from 2008 to 2009. Meanwhile, Sony's PSP (PlayStation Portable) and Nintendo's DS both saw decreases in revenue.
The PSP, which had 20 percent of the revenue share in 2008, went down to 11 percent. The DS saw a drop from 75 percent to 70 percent.
However, it seems that portable game software revenue has, over the same time period as a whole, increased from 20 percent to 24 percent. Console software went down from 79 percent to 71 percent. The iPhone OS, however, has seen an increase in software revenue from 1 percent to 5 percent.
The game market is constantly changing, and as new systems and software are released, the numbers fluctuate. Still, the data just shows the impact of the iPhone on gaming as a whole.